16 and having sex?

I'm gonna get on birth control I'm just waiting on my next period but my last period was on July 15 and it stopped on July 22 and spotting till the 24 of July, I had sex on Friday July 31 and he did finish in me I know you can get pregnant at anytime but I wasn't ovulating my period is really irregular but 2 days later I was waking up with cramps 😳  I looked it up and it said ovulation and today I had sex again but he pulled out and putting my information in here, it said in fertile today but idk if I should believe it because my period is irregular but I did have cramps today sign of ovulation. So I'm confused me waking up 2 days ago with cramps is ovulation or now is ?

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