Light period but I just started??

Br

Okay I’m a little confused! So I just stared my period and my flow is usually heavy, but it was a little bit and then it’s not. It’s light not with a little bit of brown, I’m not sure why and it’s kinda worrying me. Would anybody know why?? I started it today and it’s like light and not heavy at all. I’m so confused!! Anything would help!