No period...

Halle :)
Does anyone have insight as to what's going on? I'll try to be brief! My SO and I decided were ready to TTC in July so I stopped my BC pills at the end of the pack. I had my period in July and August like normal. I haven't had one since then. I've had two days of lighting spotting in October and November, but otherwise nothing. I'm going to make a doctor appointment for sure, but I was hoping maybe someone on this forum could share some experience with me. Thanks in advance!