Shorter period? HELP

Natsul

So we've been ttc......my period is like clock work and always about 3 - 4 pretty evenly heavy days then stops about the 5th day. This month it started right on time and had 2 days of lighter bleeding than usual then 3rd day very light spotting ... could I be overthinking????? This is the worst. I am supposed to be starting clomid on CD5 and currently this is CD3 HELLPP