Pregnant??

At risk for pregnancy? I had sex with my hubby the 31st of Jan and 1st 2nd and 3rd of this month and i ovulated on the 1st i have been having tender/heavy boobs quite frequently lately and uterine cramping and migraines(all the time). Idk what to think my last period was on Jan 19th and this months isn't due yet..for 5 more days