Hi. I'm 16. My last period was late June/very beginning of July. Lost my virginity on the 6th of July and haven't had my period since and today is August 18th. Have had sex since then as well. With and without condom but never cums inside me. I've taken a pregnancy test (two in a row actually) and it said negative. Then a third the next morning and that was also negative. I've read a lot of things saying stress delays your period... But for this long? Any advice would help. Thank you.