Confused

Hi everyone.....

Ok so on the 11th October i stated my period and it ended on 16th October and on the 20th October i had unprotected sex but he pull out of me then on the 25th october i started to get cramps then shortly after that on the 26th i started bleeding like a normal period. I took a pregnancy test on that same day and it says "not pregnant,shit" hen it stop just for a couple of hours. In the 26th October i took a pregnancy test and it come bk that am not pregnant "crap" not the bleeding has stop and the colour is now brown.....am so confused because at this moment in time am expecting to be pregnant. Is this a doctors thing or do i just waiting around like am waiting on a bus.....lol