Pregnancy advice?

Ha

Please someone help me decide on testing or not.. I have irregular periods me and my fiancé weren’t trying but we had unprotected sex. I am cramping, nausea for 1 week and half. Only at night on certain time I have a three year old but never had cramping I don’t know if I should test I start my period supposedly tomorrow but I always spot two days before and slowly starts to increase blood flow? Should I test or no? Have a pap in a week..