Is it normal ?? HELP ๐Ÿ’‰๐Ÿ’‰

So it has been 3-4 weeks since i have started my birth control pills for the first time. I am 17 so Iโ€™m new to this. So Iโ€™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 Iโ€™ve been taking the pills at the right time everyday. Never missed a pill.

Is it normal for my period to not come?