I'm happy that it is tested in pregnancy as would only be 2ish years max that I've had it for, otherwise I'd have no idea as I have not needed blood tests for anything un-pregnancy related for a very long time.

I'm about to go get my script made up. I'm not looking forward to taking something everyday for 6 months but if I need to, I'll have to do it.

Thanks again to everyone for your help and for sharing your experiences