Hi Keen, well for me I was on an IVF break (had previously done one full stim cycle and one FET), I actually fell pg the month before I was going to start stimming again. I have PCOS so begged the IVF doc to prescribe me Metformin and Clomid so that I felt like I was still TTC even on the break. I took Clomid for two cycles but the depression side-effect was too much (and had done Clomid before without success) so just kept on with the Metformin (which can normalise insulin response in PCOS women). I was absolutely not TTC the month I fell pg, I stopped taking my folic acid, went on a major diet and exercise regime to get me in tip-top shape for the next IVF, and did not do any timed BDing. I am just extremely lucky, after TTC for 3.5 years there was no doubt that there was something wrong with my fertility, but somehow I managed to produce a good eggy that stuck.