Need help

I normally don’t have my periods regularly so I’m not sure what’s going on and I wanted you guys input please.

I am not regular with my periods but once I start I normally only have it for 7 days but just recent like 3.5 weeks ago I start very very light and it happen for 4 days and then stop for a day or two and then start up again and did that for couple days and now it’s been 2.5 weeks since I have it and again it’s very very light. An I don’t have any pain at all it doesn’t smell like my normal periods which I know it’s weird I know what it usually smells like. But anyways I have been talking to my OB and she told me to book a appointment and I did but it’s not until late December. I just want to know what you guys think it is.