Really low bbt

After my last cycle, which ran very long, it looked like I O'd then got my period. Probably the worst I've ever had. Not necessarily the heaviest (typically a light, lengthy blender) , but definitely the most painful and weird. Had horrible migraines, under arms were very very sore, severe exhaustion, cramps...the works. well, it kept starting and stopping...horrible pain each time. lasted maybe 4 days. now I have off n on spotting and the lowest bbt since I started charting. Isn't 95's a tad low? I've been ranging straight between 96-97, not much over..if any. Anyone know what might be going on here? also been MEGA moody