M/C after Merina

Hi there, i have 3 children already from previous relationship. Im 38 and my new partner and i decided to try for a baby as he has no kids and wud dearly love one of his own. I had Merina removed after a year and was told we could try sraight away and fell pregnant during 3rd cycle. Unfortunately pains and bleeding started when i was nearly 10wks but when they scanned me i was told that the baby had died at 5 weeks and that i was having a 'missed misscarriage'. I had never even heard of this before and was totally shocked as i still had very strong pregnancy symptoms. Well that was back in Oct and now on 2nd period since the m/c so going to test for ov this cycle and pray that we get lucky. I have no idea if using Merina had anything to do with m/c, is it possible that the lining of my womb was too thin? Would be grateful for any feedback - so scared of same thing happening again! Anyway good luck and baby dust to all u TTC'ers. sarah xxx