Hi. I Had Protected Sex With My Bf, July 27,

Hi. I had protected sex with my bf, July 27, 6 days after my last period, he also pulled out just to be very sure. I'm expecting to have my period by tomorrow but up to now I'm not experiencing any of my usual pms symptoms like tender breasts. Although these past few days I feel bloated and nauseous. I also feel sudden mild cramps that goes away easily and backpain. I also noticed a white sticky discharge on my underwear today. Could I be pregnant?