[AmIPreggers7324]

Im 17 years old. I lost my virginity on June 30, 2012 w/ out protection & I'm not on any kind of birth control & never have been. On July 4th I had sexual intercourse again. My last period was June 14 (first day of my last period) & my cycle is 28 days long with that being said my period should have came on July 12th or 13th , but it didn't & I'm never usually late if so just 2 maybe 3 days.. So I started to worry , I took 4 pregnancy tests , one came out positive the very first one & the rest were negative. I called Pregnancy help center & made an appointment , I went in & the test came out negative. But I was having brown spotting & discharge & kind of light pink as well.. Then it went away , the next day I was actually bleeding but just when I wiped , my pad only had some spotting , still a bit brown.. Its been 3 weeks since I had sex the first time , & 2 weeks that I had sex July 4th.. Could it still be too early to detect whether I am pregnant or not? Was I just stressing out too much that it caused my period to be late? PLEASE help.