I'm a little considered if I could be pregnant. I'm a 18 year old on the nexplanon for birth control , I had sex 3 times on two different days (03/11/17&03/12/17) after my last period (03/10/17) . We did use condoms but my bf did cum inside of me . On the 14th of this week I spotted brownish just on my underwear, a few drops and then on the 15&16 I spotted a bit more reddish on a pad . Not heavy at all just a few drops , my periods are irregular but I've never experienced spotting like this before . My cervix mucus is a bit watery, my appetite has changed out of nowhere , and I feel nauseated easily. I'm tired more than usual. Could I be pregnant? Thanks in advance