Odd period- very light

My husband and I are trying to conceive and have been for over a year. We recently went to a reproductive specialist. When the doctor did the physical examination he said that I had follicles ready. Fast forward to this weekend I got what I thought was my period. Went on day 3 of my period to get blood work done for the infertility. My problem is that my period is no where normal to ever. The period is way light. Had some cramping on the first day, but have not had any bleeding like I normally do. Is it normal to have light periods or is it something to worry about?