Should I worry

Background info:

I switched broth control pills 3 weeks ago because my pill before was causing me to breakthrough bleed. I am on the sugar pills now and I am good about taking my birth control on time. I haven’t been off of birth control for about 3 years now.

Anyways, my boyfriend and I had sex the week of the start of my new pill. We didn’t have a condom and he pulled out, but some semen got inside of me, so the next day I took Take Action. I’ve been stressed out about it and now I’m on my sugar pills. With my last pill, I got my period of Wednesday, but I’m worried that I am pregnant. I have been super moody and my emotions have been everywhere this past month, but I’m not sure if it’s stress related to college, being away from home, the change in the pill, or if I am pregnant.

What’re your thoughts?