I was googling earlier which came up with something I've suspected for a while now. I think because my periods are of varying lengths each month (from 30 to 35 days) and even doing the deed regularly isn't bringing about any pregnancy, so there has to be an underlying cause for this. I suspect it could be anovulation (where ovulation doesn't always take place each month) so obviously no ovulation= no egg=diddly squat chance of producing a baby...
anyone else feel like this may be happening to them?