might be pregnant ?

Elli • Elli~ 19~Midwest but east coast raised~lover of memes and dogs~wiccan~self-deprecating hipster
So me and my boyfriend had unprotected sex for the second yesterday (I ended up getting my period two weeks later and even took a test to make sure, which came out negative. I also started the pill right before my period started and he also didn't cum inside of me) 
I'm a little paranoid, because I've been on the pill for about a week and a half and I know that it doesn't work as well if you don't wait a month before having unprotected sex. He also came inside of me this time, and in the past he's had 100% unprotected sex with other girls and never got any of them pregnant so he thinks he may be sterile, though I don't want to bank on that since women in my family are extremely fertile. 
I also just finished my period last week so I'd technically be in my fertile window if I wasn't on the pill. I've thought about taking a pregnancy test but I know it's too early to tell. 
I'm not sure what to do exactly, whether I should tell my boyfriend or not? Or if I'm pregnant if I should tell my parents (who still think I'm a virgin and would be pissed if they found out otherwise) when I find out?

Glow Resources

Let’s Glow

Glow is here for you on your path to pregnancy

Glow helps you navigate your fertility journey with smart tools, personalized insights, and guidance from medical experts who understand what matters most.

25+ million

Users

4.8 stars

200k+ app ratings

20+

Medical advisors