Is a miscarriage on the way??

So my LMP was 25/01/18 and I took clomid 50mg and got a BFP on the 27/02/18 with a clear blue digital saying 1-2 weeks pregnant. My scan on 28/03/18 showed a fetal pole of 3.7mm with yolk sac, but today 05/04/18 scan showed the fetal pole had only grown to 4.2mm (0.5mm in 8 days) still no heart beat detected. Not sure how many weeks I am/meant to be.

Midwife said results are inconclusive and another scan will be done in a week.

Anyone have any idea what’s going on.....