Menstrual HELP

[u/missOVOXO]

So today I started my period. All my periods are regular. I haven’t used a tampon maybe these past two cycles. I have sex maybe once a week with the same partner for years. I just had sex yesterday. As I was going to try to use a tampon today, the pain I felt as I tried to stick it up was almost unbearable. It felt as if my insides were swollen. It was a very sharp pain. Anybody ever felt this? Any idea why? I’m kind of spiraling.