Suddenly not ovulating

I’ve been temping since February. My cycles have all been pretty similar besides when I got pregnant at the beginning of June. I ended up losing baby at the beginning of July. I began temping again and had a normal period after that. This cycle is way off. I haven’t had a temperature increase showing an ovulation or a positive ovulation test. I usually ovulate on the 15-17. It’s day 21. Should I be worried?