Has anyone heard about this before? Is it a sign of something bad?

I had a bbt dip at 3dpo for one night, then it started going up again until today. I’m now 7dpo and had another bbt dip. My bbt usually goes up steadily, then dips a few days before AF, but this time I’m all over the place so it’s scaring me. We’ve been ttc for 10 months and this is my least hopeful month yet because of my bbt😢