Hey I really need help and somebody opinion. I am 16 andmy period still haven't came on. My last period was February 25(start date); I have sex on March 16 unprotected . We used withdrawal and ever since then I've been stressing day and night looking up all the info I can. I got a cold a few days after sex. I took a test March 30,April2, April 6, April 14, and April 20 all negative and I took them in the morning. my period still haven't came on and my boobs just hurt because my boyfriend accidentally elbowed themm. I'm trying to keep calm but idk I heard pregnancy test can be negative but have a positive blood test. I just can't tell my mom. help anyone?