TTC question

Hi everyone! I feel like I’m starting all over, my son is about to be 6 and we just started TTC. So I have a lot of questions as if I’m a new mom lol.

So I stopped taking my BC pill 2 weeks ago, my last period was 9/27 so according to that today would be my ovulation day. I don’t know how soon one can get pregnant after the pill but is it likely on the first cycle? We did have sex today (suspected ovulation day) and 2 other times in my fertile window. I’m wondering because I’m having some stomach/pelvic cramping. I’m not sure if this is just a symptom of coming off the pill or if something else may be happening. I never expected to wonder about symptoms this quickly after stopping the pill lol.