I did OPK but I never got a positive, though I've heard this is quite common on clomid. I haven't been temping because i've moved across the world (from Japan to the USA) and sleep has been off and on at weird times and no thermometer so I don't know if or how many DPO I am.. I have cycles that range from 26-56 days in length off of clomid but I don't know what it would be after clomid so I don't know what to test.. I heard to wait until CD 28 but that seems so early to me (since I have such a long cycle normally!!) so when should I take one?