Late!

So I had sex for the first time on June 28. Me and bf went raw for the first time. He didn’t cum and was constantly checking for Sperm. The day before he did master-bate so he couldn’t finish when we did have sex. It’s been a month since we had sex and I’m 7 days late for my period. I’ve been really stressed and anxious gained weight. Took a pregnancy test came out negative but haven’t gotten my period for the month of July and most likely won’t at this point since there’s a day left. I don’t think I was ovulating anyway but I’m not sure I’m why this late. Or why I didn’t get My period in general.