Short cycle?

Jami • 10 yr old boy, 18 month old boy, angel baby daughter, and B/G twins due in February.
Ok so I had my IUD out on January 28th.which kick started my period and I bled for 7 days. Normally I have a longer cycle; 32-34 days. It's been that way for a few a years. Well my next period wasn't due for a while based on that and I started bleeding Sunday night real light. Didn't think it was anything other than light spotting but lo and behold, it's shark week (I don't call my period AF.) and I'm back to bleeding like normal. That's a 23 day cycle. I didn't buy any OP test strips because I had no clue how long it would take my body to balance out and have a normal period but based on CM monitoring, I had no EWCM so I don't even know if I ovulated. I most think it's really weird that I had such a short cycle. I've ordered OP test strips and will be testing during this cycle because now I have no clue what to expect. Anyone ever have anything like this happen??