TMI? Odors and more after period

EVERY time after my period stops I get a horrendous odor for like 3-5 days (sometimes up to a week) immediately starting after my period ends. Sometimes there’s discharge, sometimes not. And when there is it’s usually either like remnants of period “stuff” or a white-ish color. But it smells so bad. (SORRY!) but I feel fine? Everything down there feels fine. I’ve noticed it for the past 6+ months at least, if not longer. It goes away, but comes back EVERY period like clock work. So, I’m trying to decide if this is worthy of a dr. Call or not. (I guess me asking online is probably a sign of yes) but I HATE going to the doctor, especially for female reasons. Plus I don’t really have $40 copay to throw around right now.

Should I try douching? I know that’s not really recommended anymore.... could it be my tampons? I use U by Kotex, and have been since high school. (Now 22) I want to switch to natural soon anyways.

The most recent change is my IUD, but I’ve still had that for over a year and a half now