I started my last period 4th January I then had unprotected sex on 16th 17th an 22nd of January I think I ovulated on 16th or 18th what are the chances I'm pregnant or could become pregnant I been having cramping in my belly since yesterday mainy my right side I'm not due on till 1st of February

Any time you have sex, protected or unprotected, you risk pregnancy. Only time will tell.