Pregnancy scare!!! Help!!!!

Me and my boyfriend had sex last night unprotected. We did the pullout method (not 100% effective we know) and he came on top of my belly. We took a break and went again a couple minutes later. Well, I checked my calender turns out I’m supposed to be in my

Ovulating cycle right now so I’m scared Ive conceived cus I’m very nauseous. I’m taking plan b tomorrow. Do you guys think it’ll be effective?? How soon can you conceive after having sex if you’re ovulating. I’m a little scared rn. Idk if my nausea is just my mental cus over thinking.