really need answers please!

so I've been on birth control for 3 months now, and about 3 weeks ago I started taking antidepressants. I haven't gotten my period whatsoever and it's been two weeks.... (was suppose to get it on sept. 22)
last night I had sex with my boyfriend and he came in me and I'm unsure if that just messed up my whole menstrual cycle since I'm 2 weeks late...

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