2nd miscarriage after a baby..

Elizabeth

My baby is 8 months old. I had no complications during pregnancy or during delivery. I got pregnant in April and at 6 weeks I had a miscarriage. I was waiting for one cycle to go by before trying again and my period didn’t come. I took a pregnancy test came back positive. Now three weeks after the pos result, I start bleeding and painful cramps. Anyone have a similar experience? Opinions on what it could be? Anything helps... thanks!