BBT help!!

So my bbt for the last 3 days has been 97.17, 97.15, then today 96.80. AF left the building on the 2nd unless you count the "aftermath" or brown discharge as the last day of AF. If so, she left on the 3rd. My temp has been going down slightly... is this normal? I39m super new to charting. I know when you39re ovulating it shoots up and all.. just wanted to make sure everything was normal.