When trying for DD, AF was rather regular and I got pregnant after only 5 months. Since having DD (16 months) AF has been all over the place. I thought we had DTD at the right time after signs of ovulation and when I was late I thought it had happened but all 4 tests I've done have been BFN, I'm now on day 35 of cycle and still no sign of AF showing up. Any ideas of how to get pregnant if you're AF is very irregular? :(