Hello,
I had sex on December 22nd and December 23rd. I'm not on birth control and he didn't use a condom. We used the pull out method. I didn't really panic because I had gotten my period 4 days later, on the 27th. It seemed pretty normal. It lasted 7 days as it regularly does. I thought to myself, "Okay, Im good." But now I'm really worried because I've been feeling nauseous, I have backaches, on and off cramps, I've gained a little bit of weight, I sleep so much, my nipples look darker and bigger, My appetite has increased and Now, my period is 3 days late! Is it possible that I can still be pregnant even if I got my period 4 days after unprotected sex? & If I am pregnant, how far along would I be? Please help.

Yes, it's still possible you are pregnant. You are now playing the waiting game and have to wait until your period is 2 weeks late and then test using first morning urine.