BBT low for 2 days but no period?

So I haven't had any period or pregnancy symptoms and I took a pregnancy test 13 dpo and 15 dpo (test reads as low as 25 mIU) both negative. Well at 15 dpo my BBT dropped to 97.1 and this morning 97.1. Cervix feels low, hard, and outer part open. No CM really except here and there. No boob pain or nipple pain, no fatigue. I'm very confused and worried.... I would really like my period...

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