Ovulating before getting your cycle back?


Ok guys so it's been 3 weeks to the day since we lost peanut and had a D&C.; This morning I took an OPK and it came up positive. Then this afternoon i thought well maybe it's left over HSG better take a pregnancy test and it's NEGATIVE. There's no way I'm ovulating again so soon right?! I haven't even gotten my period back yet. Gosh I hope this is it. My husband is on his way home from LA right now too. Talk about great timing!!!