Thanks girls for the well wishes on ovulating!
Actually I just did an OPK, but forgot about it cos I was on the phone. It was positive, but it had been about 15-20 minutes. The tests say to disregard any result after 10 minutes. So I did another and the control line is fainter than the first test, but the test line is the same as it. So I think it's a positive, and I'll get BDing tonight. Still no pain or symptoms at all though, and I'm CD21 today.