We conceived on the second cycle (and had DS1). We conceived DS2 naturally and unexpectedly (... I assumed I'd have to go down the Clomid path again!).
Before DS1 my cycle and AF was all over the place - I wouldn't have AF for months, then I'd have a looong AF - up to 3 weeks. Then nothing again for ages.
I was supposed to take Provera (at least I think it was Provera, it started with a P) to start with, but after the fs saw my blood results, he said just to start straight away on the clomid - he seemed to think there was no point bringing on AF (can't recall the full explanation). Anyway, didn't work for us that month, so AF came and went, started second lot of clomid and bingo ... BFP not long thereafter.
The only side effect I recall is sharp twingey pains in my abdomen, for 1-2 days each cycle. All in all, it was worth the relatively minor discomfort.
Good luck with things.
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