Hmmm! I'm not really sure...they usually check your estrogen before ovulation, and then progesterone after. Did your doctor say why he/she wanted to check your estrogen level after ovulation?
????? IDK either because I always thought when you actually conceived your estrogen would stay high after "O". Well when mine dropped I thought I was out of the race, but I was indeed Preggo. My RE said estrogen usually drops about a week b4 AF is scheduled to come, and goes back up after AF should have arrived if you are indeed the PG! Good luck to you though I hope it is a good sign! :)