Progesterone Cream and BFP

Nicola • I`m a 28 year old teacher from the UK. Had my rainbow baby in September 2017 after miscarrying twice.
I had my BFP yesterday and this cycle I've been using progesterone cream as I have a short leutal phase and miscarried in March. I've read that I need to keep using it til 20 weeks. Anyone used it?