Nervous and maybe jumping the gun

So first week of November I had unprotected sex without a condom and while on my period. He pulled out and everything but now my period is 3 days late and breasts feel slightly bigger and sore. I've also been emotional more than usual, bloated, and exhausted this past month. Im currently in the military and serving over seas so I'm super scared about what's going to happen if I end up being pregnant. Is there a chance or is it too early to tell?