Hi. I am 40 and been ttc for 2 years. Already got a DD who is almost 3 and she took a long time to arrive. Last two years we manage to conceive and implant and get a bfp day before and of period, then my period starts, cramping and the bfp goes. Referred myself to private clinic as nhs takes too long and only thing they recommend is to take DHEA and plan for ivf. Has anybody been in similar situation? Why would IVF work if we can conceive just not able to have a successful and long implantation? Thanks