Need help or advice. just something.

I was suppose to start AF today but it never showed. I took my temp the 30th and it was 98.1. I just took my temp today around the same time I did the 30th and today as the picture says my temp was 98.6 ... your temp usually decreases when your about to start AF but have any of you ladies had your temp go up the day of or after your AF was suppose to come but never did and still got a BFN?? I haven't taken a pregnancy test yet cause I just honestly didn't want the disappointment and I honestly thought I was gonna start but I don't know. Can anyone share there experience or tell me what this means