Should I take a plan b?

Not really sure where to post this.

My boyfriend “accidentally” slipped his dick back in me right after he came. Obviously semen was Still on his dick so it got in me and on my vulva. Fucking dumbass. I’m supposed to ovulate in I think maybe two days. I took an lh strip and it’s negative but close to positive. I really hate plan b as it fucked up my cycle for months when I used it years ago and just made me feel like absolute shit. I’m talking irregular periods, weight gain, and mood issues. It was hell. But I clearly do not want a baby right now. Here’s a pic of the strip for reference. I just wanna know if it’s really worth taking at this point, I know strips aren’t 100% and I really only consider plan b as a very last resort.

Also, we had a serious talk about consent and basic fucking biology.

I know.