Hi there Hippychick, good to hear from you! I remember chatting with you back in December; glad you managed to track me down again. I'm so, so sorry to hear about your MMC - here on this thread we had loads of people going through MCs in the early weeks, and it was just so heartbreaking. Best of luck trying again - on the positive side, at least your recent experience showed that you're able to conceive, so no reason why you can't do so again.
To answer your question, yes, I did keep using the cream after I'd got my BFP. I'd almost forgotten, actually, but early on in the pg I went through real agonies about whether to continue with it. My consultant had told me it was unnecessary full stop, and I was also concerned about 'medicating' my pregnancy by continuing to take it (I was also paranoid that I'd forget to take it one day and something dreadful would happen). On the other hand, I knew how awful I'd feel if I stopped taking it and then MC'd (because I'd never know whether stopping the cream had caused it). Anyway, to cut a long story short, I eventually decided that I would start to cut it down gradually after my 12 week scan, just using a tiny bit less each day, and I eventually stopped using it altogether at about 15 weeks IIRC. It was a tricky time, because every time I felt a cramp or something, I was terrified that it was because I was cutting down on the cream. But, as you can see, I'm 24 weeks now, and all is well - and I've finally stopped worrying about it. Actually, as soon as I'd had a couple of weeks without the cream at all, I felt pretty happy that it had been ok to give it up.
Sorry, long ramble. In short, I'm pretty convinced that the cream helped me to conceive (or rather, it helped hold off my period for the crucial few days while the baby had a chance to implant). I actually have no idea whether the cream made any difference after that - it may be that I took it unnecessarily for three months - but it certainly doesn't seem to have done any harm, so in retrospect I think it was the right decision, for my peace of mind if nothing else.
HTH. Very best of luck with your TTC, and do come back any time if you want to ask me anything else - I'm only too delighted to be of any help I can.
(I'll try to find your other thread to post this in as well.)