Stress affecting my period ??

So I’ve been really stressed lately I feel like everything is happening at the same time but the biggest thing is that I overthink the chance of getting pregnant. I’ve been on birth control since April and I’m 17, the first kind I tried made me nauseous and caused tons of problems I just switched to a knew kind about just under 2 months ago and things are much better except I skipped a period and that has never happened to me before. Me and my BF have sex regularly but he’s always got a condom on so it’s not like we are doing it unsafely. I was already having problems with other shit and so I lowkey think that I’m doing it to myself. Like I’m stressing about every little thing that isn’t normal and it screws everything up I don’t know how to deal with this. Thoughts ?