Thanks for responding, Soili and Sunny!
I agree with both of you regarding the high estrogen not properly balancing the progesterone. (I still think it's BCP related...the thought that all of those years I was tricking my body with fake hormones and not thinking anything of it makes me wonder how I could have thought that everything would be hunky dory later in life.)
Anyway, I wanted to update you. So today is Thursday. I started spotting Tuesday morning, (8 dpo) and have been applying progesterone cream twice a day since that night (a total of 4 applications so far). I spotted on Wednesday too. I am about to hit you with some TMI, but I spot heaviest (usually red blood) during and directly after a BM. Well, this morning, after my BM, there was the TINIEST little bit of brown spotting on the TP, (it was beige, really) hardly anything compared to what it usually would be on 10 dpo for me. This is a HUGE improvement! I am very excited about this.
I am going to continue the cream until my AF is due (next Monday), and then I'm going to start it again 3 dpo on my next cycle. I'll keep you all updated.
Oh, and I try to avoid xenoestrogens too, since maybe we're all suffering from estrogen dominance. I try to eat organic meats and dairy, and no soy products. I'm going to continue that as well.