Bbt chart help please!!!

Melinda • Had 4 miscarriages in 2015 and had our rainbow baby December 2016
Can anyone please help me understand my chart? I have no idea if or when I ovulated. I usually use OPKs to help but we've even busy packing and moving. I had a very early miscarriage feb 24th and a few days later my levels were negative. Please help me understand my chart.