Pregnant? Symptoms? HELP!

So I'm not due for AF until 11/05. My husband and I had unprotected sex and I just started my BCP OrthoTricyclenLo. For 2 days now I have had hot flashes at work and have the chills at night before I got to bed. I've had little cramps here and there but nothing horrible. I've also had little waves of nausea here and there, especially at night though. Idk if it's in my head or I'm just PMSing but can any of yall help me out? Has anyone had symptoms like this before?