AF due in 2 days. Thought I was starting to see the BBT trend decrease but now today it jumped back up. Any one experience this and still get a BFP?

Maggie • 31, married. Pregnant with rainbow baby #2 due March 28, 2020. Missed miscarriage March 2019 at 8 weeks. Miscarriage November 2018 at 4 weeks. Rainbow baby Aniela Jane born June 21, 2016. Miscarriage June 2015 at 5 weeks.