Mrs O'M, sorry to hear your cycle was cancelled. Sounds like your follicles developed very quickly and took your FS by surprise? Being over 30mm, they would likely have been "over-ripe", so sounds like the right decision under the circumstances. I assume you'll have more frequent monitoring next time to avoid a repeat occurrence?

Kel, if you're willing to risk the uncertainty of "Did I just test too early?" if it's a BFN, I'd start from 10dpo because it's not unusual to get BFPs that early, but not everyone will get one that early (I never have). If you'd rather know for certain from the first test, I'd wait until 13dpo. In both cases, I'm assuming you'd use a sensitive test like the First Response. If you're not using a sensitive test, you really need to wait until AF is late... I got my first BFP (chem pg, so low hcg levels) at 11dpo with FRER (but it was so faint I thought I was imagining the line and it was BFN and only believed it was real after getting a darker line at 12dpo). Last time (normal hcg levels) I was using ICs and didn't get a BFP until 13dpo (but I think the FRER would have given me one earlier).