Question

Anyone found out they were pregnant but had low blood coming out but were pregnant??? 
I took tests came out positive but I'm bleeding. Like very low blood flow and I'm crampy. At first day 1 with the blood it was dark brown low flow. Then day 2-3 it was light pink flow with the dark brown blood. Now it's red like a period blood but it's very low hardly any that comes out but when I wipe seems like a lot but hardly any gets on the pad. I had my baby on the 3/30. What could it be?? I'm going to see my doctor on Thursday. I had unprotected sex, he didn't cum in me but we went couple rounds and would continue. Could it be my period and the tests are just false or what???? So confused!