Confused

Miscarried about 4 weeks ago. Started bbt back up after a few days and ovulated based on both bbt and opk. We did bd around then too. Now 15 days later I haven’t had period (I normally would get it 14 weeks after peak) and temp is still up and still have a BFN. See chart below. My normal cover line is about 97.6 so I’m still well above.