D..
Hmmm.... I will tell you what my gyn told me. When this happens, you should have a uterine biopsy. If something shows up, hopefully it is "disordered cells". You go from there.
I've had one of these biopses. It's not bad - an easy procedure. Don't have sex for a couple of days before or after (my advice). I didn't end up having an issue and hope you won't either. Thinking of you and hoping all works out fine!