Can I be pregnant?

Morgan • Hi, my name is Morgan. Married. 6-8-15. Pregnant with baby #1 due April 2021!!
Symptoms are extreme hot flashes, extreme nausea, headache on and off all day, any smell makes me wanna throw up (haven't thrown up yet), breasts are sore but not super sore. AF is due on 12/16. Took a test and BFN but glow said to hold out on taking a test. Is there a possibility I could be? Been so nauseous all day long along with hot flashes.