Opinions/advice please!! Pregnant?

5 weeks ago I had what seemed like IB, sorry for tmi but it lasted 2 days wasn't like usual period, brownish discharge that kinda thing.. And since then I have not had a visit from AF, I haven't been on the pill for 6 weeks.. Went to the doctors on Monday and did a pregnancy test which came up negative. But he did some bloods and I'm going in for my results tomorrow. 
Still no sign of AF but had cravings, cramps and am exhausted.
Chances of pregnancy or something else?