Abnormal bleeding

Hello,

Me and my boyfriend have been having unprotected sex for awhile & we haven’t had any pregnancy scares yet but I’m not supposed to start my period until around the end of the month & for some reason the very beginning of the month I got weird off & on bleeding for 2-3 days but it wasn’t much blood. Should I test or should I wait & see if I get my period? Anyone else have this happen before?