<s>[INST] 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? [/INST] HIThank for asking to HCMI appreciate your concern as I always say that no method is cent per cent secure for contraception, if you have any doubt better to get done the pregnancy test, although the chances of pregnancy is nil, hope this information helps you have nice day. </s>