Shit, I might go insane!!

7 weeks PP and haven't gotten a period. @ 4 weeks PP me and my SO had sex yes he pulled out. But I told him not to even do it because women are really fertile after having a baby. And just because the pull out method worked for us when we first got together over 2yrs ago didn't mean it would work now. I wanted it just as bad so when he begged I caved. I have my check up on Monday. I'm stressing the possibility of being pregnant and my kids being 11 months apart. I can't believe how stupid I am.. 😭😭😭