Could this a missed twin? Desperate...

YNA • IVF BFP 5/14, MMC 7/14 FET BFP 11/14 DS1 7/15 FET BFP 6/16 DS2 2/17 FET BFN 11/18, FET BFN 2/19 FET BFP 4/19, baby girl due 12/19
We saw the hb at 6w3 days, then nothing the next week.  Dr is having me do a dnc tom (it had been 2 weeks, no response to misoprostol.). This was an ivf cycle and we transferred 2 - the second circle is haunting me bc I think it could be a second baby.  I have an oddly shaped uterus.  An I grasping at straws?