Has anybody?

My last period was january 18th, it was very very light. I didnt get my next period until today and it's the same last back in January, barley there! Like I mean barley anything, not enough to even use a panty liner. I have an appointment for blood work to check my thyroid and an ultrasound to check for pcos but I'm just wondering if anyone else has had this and what was the outcome. My cycle is usually the same with a normal flow so this is just really confusing to me.