50 day cycle after MC

Lauren
So I had a MC in January at 6weeks and didn't have to have a D&C.. I knew it would be awhile before my regular period but that wasn't the case I started having my normal period within the month which is normally 36 days but then all of a sudden since we started trying again I've been having 50 day cycles which is confusing me because I keep goin and buying pregnancy test but then end having short periods which mine would last 5 but mostly 4 now they are only like 3 days barely ..I've been to the obgyn for blood work but I don't know what could be goin on.. has anyone else had this problem after a miscarriage ?!