Thankyou everyone for all your responses and support

Michelle- Yep, my GP said that was probably what they were on about with the placenta but said this is very rare and I've already had a scan showing the baby was ok. If it was a molar pregnancy it is very very unlikely I would have made it this far, there wouldn't even be a baby. And if it was a partial molar it's unlikely I would have made it this far either and extremely unlikely I would make it to the end!! I find it a bit weird they start thinking about all this from a blood test at 8 weeks that was still in the normal range. Maybe they like stressing people out, lol. At least they're thourough!!