I could be wrong but I think this is to stop LH hormones rising so equivalent to cetrotide which I think was about £50-75 can’t quite remember
Not sure why you’d need it though If doing a natural FET and if it was an NHS cycle they may only have given it to ensure you ovulated on a day which was convenient to them to avoid transfers on the weekend?
I probably wouldn’t be doing natural. I’m just going by my last FET. Had that injection on day 25 as my periods are irregular then progynova maybe a week after that (can’t quite remember) but this will be a private cycle now as we have our LG X
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