BBT dropped from 98.4 to 98.0- no period

Hey everyone! I hope someone can help me, or has experienced this. My bbt has been elevated for about two weeks, but this morning when I checked it went down slightly by .4. So 98.4 to 98.0. I was due to start my period today. I don’t have cramps, but I’m feeling slight pain in my upper inner thigh. Could I be out this cycle and AF is coming- or should I still test? I am about 15 DPO. Would love to hear back from you. Thanks! This is my 9th cycle- first cycle unmedicated. I ovulated on my own- progesterone was 10.2 as of 10/21. Okay- thanks!