Too soon? NEED HELP

Hey ladiesssss!

So my boyfriend and I have been together for 4 years, we have never used a condom nor am I on birth control. We always said if it happens it happens. Well last Saturday we had sex that morning and he came inside me, I’m not on birth control. I do have two other children from a previous marriage age 7 and 5. Is it possible to have early pregnancy symptoms? I’m only having very sore breast, nausea, and dizziness here and there. I know with me being 8 days until my period it’s too early to get a positive but did anyone else have early pregnancy symptoms?