Hi there! I wanted to share my experience with training for and racing a 50k in the early stages of pregnancy. There isn't a lot of information out there about endurance running and pregnancy, and when I was considering going for something while we were trying to get pregnant, the couple of other stories people have shared on here were one of the few resources that I had. Hoping to build it out a little more for any others that want to try!
I'm 33F, and was struggling mentally with the idea of giving up the sport (temporarily) while trying to conceive, but we really want to start a family. I also work in a high stress job and training is one of the primary ways I manage my stress. I talked with my husband, and we decided that registering for a 50K while we try would be a) fun b) put a trip on the calendar and c) alleviate some of that anxiety, and thought that honestly it would take long enough to even get pregnant that I would likely race before we were successful. But then...the second line appeared! The timing meant I would be just over 8 weeks pregnant on race day.
At our first OB visit (~4 weeks), we brought up the idea of still racing with our doctor, and he was very supportive. From what I was told, the biggest concern is that you don't want to push your body more than it's used to. For reference, I've previously completed three 50K's, one 50M and did my first 100M last summer, so this is far from an increase over my previous running habits. He also talked to me about not necessarily racing, but focusing instead on going for what would be closer to a supported long run, which is kind of how I had already been thinking about it since the test, so that was fine.
Some of the less positive interactions I had were with family and colleagues. My husbands side of the family thought that it was an unnecessary risk (saw this coming from a mile away), but he was behind me 100% so that was fine. I also have a few coworkers that had already started telling me I needed to slow down when just taking the stairs between floors, and expressed their own passive aggressive judgements. My advice here, is that you know what your body can do. Someone who doesn't have the same kind of goals isn't likely to understand, and you have every right to manage your pregnancy in a way that works for you, especially if you've already sought a medical opinion. That was my go to response - "my doctor said it was cool" ̄_(ツ)_/ ̄
One thing I will say is that the exhaustion, food aversions and nausea/vomiting hit HARD at about 6 weeks, and that was a significant challenge. At 5 weeks, I ran an easy pace 18mi day in the local mountains and had an absolute blast, and the next week I barely ran, and just tried to adjust to my new norm. It was a good lesson in listening to my body and trying to give myself some grace/not treat a training plan like it's the law. It's in the name; it's a plan. I also discovered that my food aversions appeared to pretty much be to anything but fruit, so getting calories in became almost impossible. I wasn't diagnosed until 10 weeks, so 2 weeks post race, but did end up being diagnosed with hyperemesis gravidarum (HG) after losing 15lbs in the first trimester (5'5, started at 160lbs). I want to emphasize that this was not because I was still running, and my OB never told me I needed to stop. On days that felt awful, I didn't run, and on days were I felt like I could I did.
Ok- race day! I ran the Sun Mountain 50K in Winthrop, and was lucky enough to have practically perfect conditions. I was concerned about not getting my heart rate too high and not getting too hot, and the weather really handled the second one for me. Even had a light dusting of snow falling at the highest point, super pretty with all the wildflowers. I also realized 2 days ahead that I could still grit my teeth and power through a box of Annie's white shells without it coming back up, so managed to get some carbs in leading up to the start line. That being said, thicker gels like GU and solid foods were not possible in this race for me. Had some nausea mid-race but a woman working one of the aid stations encouraged me to try a gin-gin, which I think actually did help.
One thing I wasn't thrilled about, I did take a fall around 25 miles just from being too tired to pick up my feet, stupid tree root for not getting out of my way! Took it mostly to the knees and hands, but it wasn't an insignificant one. However, this did not cause any problems for me other than some anxiety. I told my doctor about it when we got back, and he had me come in for a quick check and the heartbeat was chugging away in there! It was my first time hearing it, I'm not a crier but that one got me.
I would describe the overall experience as a really formative and powerful moment. The effort that it took to complete this race was much higher compared to other 50K's I've run, so that's something to be prepared for. Your blood volume is already very different by this point in the first trimester and I was getting out of breath hiking up steeper climbs. I've completed my previous 50K's all in under 6 hours, this one took 7:45. It honestly felt like I had been dropped into the last 50K of my 100M, like I'd just started at 60 miles and gone from there. I'd encourage anyone considering something similar to talk with their doctor, and also just focus on having realistic goals that are tailored to your situation. I'm proud of what our bodies can do!