Is it normal ?? HELP 💉💉

So it has been 3-4 weeks since i have started my birth control pills for the first time. I am 17 so I’m new to this. So I’m on the 3rd sugar pill and i heard that you get your period around that time. I have been sexually active and he has came in me but I’ve been taking the pills at the right time everyday. Never missed a pill.

Is it normal for my period to not come?