FET prep- spitting

Hello! I am currently getting ready for my 5th FET (trying for a second). I’ve been on decapeptyl since June 4th. Currently on 2mg estradiol twice a day. My period was June 12-14 but I have been spotting light brown/red ever since my period “ended”. Has anyone has something similar happen? It’s been 3 years since my last FET and I can’t recall if this happened or not. I’ve sent a message to my care team as well but I am just curious if anyone has had the same. I go for my lining check ultrasound next week. Thanks in advance!