My last period started on March 25 and ended March 30. I recently started birth control on April 16th. My husband and I had unprotected sex on April 22nd and took a Next Choice pill on April 24th to make sure I would not become pregnant. My period has not yet came. Is this because I started the birth control 3 weeks late, my body adjusting to the birth control, or could I be pregnant?

I'm assuming that "Next Choice" is a plan B type pill. If it is, then that's likely what's throwing off your period.

Having said that, even with birth control, and plan b, pregnancy is still possible. There's really no way for anyone to tell you what's going on, you'll have to wait and see.