A month ago, I went off my birth control pill which I have been on for about 3-4 years. My last period was 1/14. I had unprotected sex on 1/28 and 1/29. My period is now 5-6 days late. I took a pregnancy test 2 days before my period was supposed to come and it was negative. However, it still hasn't arrived. I haven't felt any different except lower back pain and extreme headaches. Is there any way I could be skipping this month because I just went off my birth control? Or should I try testing again? Thank you!