My last period was Feb 10, 2016. My period lasts typically seven days and I have a 31 day cycle. I have very regular, predictable periods. According to period tracker apps I should've ovulated around Feb 27, 2016. I had unprotected sex Feb 20, Feb 21 & Feb 24 (also March 5, 11, 13 in case my ovulation is off) I took a home pregnancy test on March 16, it was negative. My period is nine days late now. I don't know whether to keep testing or just keep waiting for my period to come. I have never been late. Some of the on/off symptoms I've had within the last two-three weeks include: excessive gas, frequent urination, pings of pain in lower abdomen, achy legs and hips, bloating. I just don't know what to think and don't want to continue freaking myself out with negative test results but still no period. Please help.