BBT going down slightly

Daphne

I’ve taken my BBT for five days now and it says I’m going to ovulate on Jan 3, but my temp this morning was just slightly lower than yesterday. Does that mean anything like maybe I’m not going to ovulate? I know I took it a half hour later this morning than I have been taking it and yesterday I didn’t take it at all because I was up so early couldn’t sleep so that would have messed it up. Just not sure about what those results mean.