spotting vs period

Hello ladies! So my question is, how do i know i’ve started my period vs am i just spotting? i had my iud placed about 2 weeks ago and been spotting daily ever since (i have the skyla iud). the spotting has been heavier on some days and quite light on others, so i can still manage with just a panty liner tbh. but today my spotting has been heavier and my period is still 2 weeks away according to my old cycle. So i guess i want to know, how can i tell which is which?