I'm completely new to this forum lark, so apologies if I'm not in the right place. Can anyone help or advise me?? have had day 21 progesterone monitoring since jan, and it's been getting lower, last was 14! Recently started cycle tracking which showed a follicle ready to burst also had an HSG last week which showed tubes fine. I'm going back for rpt prog on Mon and just wondered what the lowest it can be to fall pregnant!! I have been told secondary infertility ( 6 year old gorge girl) but we're desperate to give her a sibling! am beside myself. All other bloods are normal!! help! x