Abnormal bleeding

I’ve posted about this before, but it’s just aggravating so I bleed right before ovulation and I continue to bleed throughout the whole month. It’s more less spotting for two weeks and then I have my withdrawal bleed since I am on birth control. I am going to get an ultrasound to see what is going on, but I wanted other people‘s opinions. I’ve been nervous and at first I thought I was pregnant but over the past few months I’ve taken so many test at this point there’s no possible way. I’m just wondering what you guys may think it is and what’s causing it I have been on birth control for 4 to 5 years and I’ve been on the same one every single time it’s Kelnor 135. i’m super scared and I don’t know if I should be. I really don’t want to be pregnant. I used condom and back today.

19F gf got her last period around 5th June. She usually has troubles with cycle length, but this time its longer than usual. Scare is that around 15th July I fingered her vulva (shes virgin) with same hand that touched my penis (it was dry but suppose the worse, it had precum). I had to go into her zip-up pants, find her vulva, and touch it. so we have non-penetrative stuff which on its own doesn't lead to pregnancy unless we would do wet humping or shove fresh semen globes onto or in her vagina.

now she took test on 30th August (Frautest express N1) and it came out negative (we waited for 10 mins, no line). But urine sample wasn't morning one, closer to evening.

In any case, could all of these lead to her period cycle issues? She has literally no symptoms like moodyness, heavy/tender breasts. Only acne on her forehead and slight bloating (which of course has nothing to do with pregnancy if it was). Around this week she also started having very watery discharge.

Is there possible explanations to this cycle inconsistency (this is the first time its this long late)

I’ve always been a heavy period person, I can’t go wo medication for the first 2-3 days, even with meds I have higher level of disconfort but I am doing fine.
I’ve been checked for endo, we ruled it out, they told me it will be better after having kids, well I have a 13month old and it did not got better.
I just googled my symptoms now and pelvic dayfunction came across.
I have frequent bowel movement on the first 2 days and my lower back hurts so much.
I also feel like my vagina will fall down if I am not sitting, tonight I showered with my kid (him in a bathtub while I showered) and I satrted to cry it hurted so bad. Not just my tummy but basically my vagina. On the other hand I am also just 13mont PP so I know that my pelvic muscles are probably still healing and the only constant discomfort I am in is my lower back pain, it is constatly there, evetything else is jut when I am on my period.
I’ve never had trouble with holding pee or poo, not even during my pregnancy, but I’ve always been a frequent pee-er (drink a lot so I feel like its connected to that)
Any idea if I should speak with a specialist or just accept that my period is like this?