I’ve been having cramps and lower back pain for a week, but my period hasn’t come. My period is usually accurate, last month I got my period on 8th. It’s delayed 3 days, and I’m having cramps and lower back pain. I had sex on July 28, July 31, August 1st and August 4th, condom was used on the half way, so I’m concerned if I’m pregnant, I’ve tested at home and it’s negative, but I don’t know if it’s too early to test. Why is my period not coming and I’m still having cramps and lower back pain?