Please help! Not sure what to do!

alora

I’m late for my period. I’m getting paranoid because I took a pregnancy test about 10 days ago and it came up negative. My period has always been consistent and “on time”. Last month and the month before my period was 3 days and that wasn’t too abnormal for me because it occasionally varies between 3-5 days. But now im questioning whether last month was a period or not or if I could even be pregnant after getting the negative tests. Why would my period be late?