FREAKING out.

So I had spotting on the 25th which is weird for me because I never ever spot. It was ridiculously light. So I'm thinking it was IB. So up until now, my bbt has been around 97.6-97.7.  Literally every day. But today my temp went up to 98.8. Doesn't your bbt drop before your period?? Mine usually does. I'm supposed to have my AF anytime. So is it a good sign my temp went up?