could i be pregnant?

last week i had unprotected sex but he pulled out (it was also the last day of my period, idk if that’s important. i’m also on birth control), and nothing unusual has happened. two days ago we did it again, and today at work i felt like i was going to pass out and possibly throw up, but i could’ve just been overheated bc i had on a jacket and it was a little warm, and when i took it off and got water i felt better. but this evening i noticed i have a ton of white odorless discharge and i’ve never had that before. i googled stuff and you’re not supposed to show signs of pregnancy until about 2 weeks after, but this worries me. could i be pregnant, and at this point what should i do? i don’t want to be pregnant.

also we were each other’s first time which was in june and we haven’t done it with anyone else so an std probably isn’t likely