Finished birth control Saturday. Early ovulation?

I decided to stop taking the birth control pill after finishing my last pack so that I can relearn my natural menstrual cycle before ttc in July. We had unprotected sex Sunday, the first day after my “period” (probably just the uterine lining shedding at the end of my Bc cycle) ended and I assumed I’d be fine. Now I’m reading about early ovulation and how after stopping bc some people get pregnant really fast. I’d welcome a surprise but I’d rather not be 5 months pregnant for my wedding!

My cm doesn’t seem like egg whites but I’ve only been tracking for a couple of days.

Has anyone been pregnant after having sex the first day after your period?