Advice, help!!

Ashlyn • With the love of my life. TTC #2, his first after a MC in October.
Hi yall, 
My SO and I have been TTC for two months now after a devastating miscarriage back in October. I had my last period on November 15th and I'm on cycle day 27 now. I'm feeling symptoms that AF is going to show up but I decided to go ahead and take a pregnancy test today and it looked like it was a BFN well 4-5 min after I took it, it looked like a BFP. I need advice. My BBT is higher than normal, like almost a whole degree higher. I need advice, if this is a BFP or just an Evap line. Thanks!