Letrozole

Hello ladies!

I am CD35. I have been taking 5mg of Letrozole this cycle (CD5-CD11). My period was supposed to come 2 days ago. Yesterday while I was washing I noticed some blood inside ( on my finger) and I immediately put a tampon on thinking AF it’s here. Few hours later I check it and it was clean. Literally no blood on it. I took a pregnancy test 3 days ago and it was negative. Last Thursday (CD27) I went to the doctor and I was having 3 big follicles ( 14,62mm ; 12;60mm ; 19,40 mm).

Do you guys think that might be implantation bleeding? Wasn’t a bit late (CD27) to ovulate? I am really confused.

Thank you!