Help what's going on

Ok so according to my glow app for the last couple months my period has always been 2-3 days early. This month I didn't get it early like I normally do and I was supposed to get it today but I've only had very light spotting of what I can tell is the colour of old blood, now after my last period my boyfriend and I had sex but when we finnished the condom was off and Was sometime stuck to me and we couldn't tell if he has cum inside me, should I be worried and take a test or wait a few days to see what happens?