Hi. I'm 16 years old and I'm sexually active. Intercourse 2 weeks and 4 days ago. About a week later I started to feel nauseated all the time, really bad headaches constantly, really tired, tenders boobs sometimes, and just kept feeling that way. So I started to get worried. I thought I had started my period two days ago. But it was only spotting then when I wiped the blood vanished. It was bright red. Now it looks like older blood and its still spotting sometimes, and sometimes a little more, but not enough to fill up a pad or a tampon. Then I wipe, and still, it vanishes. I have a few cramps sometimes in my lower stomach. I don't eat as much now. Plus, this doesn't feel, smell, or anything like my normal period? Could this be implantation bleeding? Could I be pregnant?