Hi Lissie,

My understanding is that your lining will continue to thicken right through the rest of your cycle. The lining continues to build with both the oestrogen and progesterone and only starts degenerating (called the ischaemic phase) if and when there is no longer any hormones present in your body to maintain the lining.

This is the equivalent of your body stopping (in particular) progesterone production leading up to AF in a natural cycle, in the case where pregnancy hasn't occurred. And in your case (an artificial cycle) the ischaemic phase happens if and when you stop the hormones if you've had a BFN. It usually takes 1-2 days and then AF starts.

If implantation has occurred then your lining will continue to thicken even more as you body starts producing more progesterone and starts getting ready to hold the placenta!

HTH, and I hope that your ET tomorrow goes really well. I wish you lots of luck and hope the TWW goes as quickly as possible for you. I think after ET as long as you are taking things at the pace you feel comfortable with then everything will be fine!

Good luck,

Miss C