got period, still pregnant?

I am very confused about this. I ovulated the first of this month and had unprotected sex 6 times before I ovulated. I thought there might be a chance I got pregnant, so I waited a week and half and tested. I got 3 pos but they were faint. Then when I went into the doctor's she gave a urine and it was neg, but she told me their tests wont be pos until after a missed period and I hadnt missed mine yet, then it came 2 days late and it was really short ( 3 days tops). The flow itself only lasted a day and the rest was light spotting, it was dark red/brown in color. I didnt think i was preg because I still had the usual cramps and back ache, but before that i was really tired and hungry all the time, I figured it was just pms, but its been over week since then and Im still achy in my back and pelvic area, and Im still really tired all the time and my bbs are still enlarged, but they arent that sore anymore. Im not going to waste money on an hpt if there is no chance that I could still be pregnant, but Im just confused. This same thing also happened to my mom when she was preg with me. Is this sort of thing genetic? Am I still preg?