symptoms or is it just In my head???

hey all so I'm 8 DO and I'm due to start my period on the 13th. my boyfriend and I last had sex on the day before ovulation and the day of. I have noticed an increase in thirst and more potty breaks. tonight my boyfriend was eating soup and it made me nauseous, I'm tired all the time and iV been craving cherry Pepsi and Mexican food... my chest hurts but not super bad but my nipple hurt the most. idk if it's all in an my head or if I'm possibly pregnant. this would be my 4th pregnancy with one MC. any advice???