hey, I have a question. My periods are really irregular, me and my boyfriend had unprotected sex on january 17th and my last period was january 1st. he did not cum inside me he pulled out and ejaculated like 3 mins later. i still have not started my period and took 2 test one on feb 6th and one on the 9th. (21 and 23 days after sex) both were negative. could i be pregnant? or am i just stressing myself out?