BBT confusion...can anyone relate?

Lindsay • I love my family, best friend, my dogs, and my husband!
Ok so here's my chart this month. It's my first month temping. Is my BBT doing what it is suppose to do? I thought my temp should drop for my period and yesterday it did but today it spiked up again. AF was due today but actually started 3 days early which is very weird for me. Been TTC 7 months now. Only had one month where period was a day early. Just curious if my BBT is on the proper track...thanks.