Should I test?

Shannon

My period is five days late. I've always had irregular periods. I had sex on the 6th of last month but then got my period on the 8th of that month. I then had sex this past weekend. I was due to get my period and I have sore boobs and pms symptoms so should I test myself or wait for my period. I dont know if I could possibly be pregnant from last month because I got my period please help.