Possibly Pregnant?

✨JBR✨ • Married for two years. Nanny. We're expecting our first baby in March!
Hi, my husband and I are not trying to conceive (but we isn't exactly preventing it). Anyway, I've been having serious pregnancy sypthoms (I have extreme fatigue now along with gas, bloating and nausea.) but I know that could possibly be PMS sypthoms as well. My period is suppose to start in two weeks. 
This could be our first baby... Any advice?