Weird light period

Lettie

Hi, I was all excited waiting to get my period this cycle, so we can try again on ovulation day. Well, my period was A. Late and B. Extremely light. It was more like spotting. It has been on and off for about 2/3 days. I haven’t even needed a pad or tampon. Last month was completely normal. I will say I am on thyroid medication, but this has never happened. Also, new this month I have just lost 10 pounds due to diet and exercise. Is this normal? Can I still ovulate like this? I’m super bummed and emotional. I have taken preg test it was negative. Please help 🙁