Hi everyone, I need help

About a week ago I went out with the bikes with my family, we cycled for about 3 hours it was really hard I haven’t touched a bike in about 8 years. The morning after I realised that I bled a little bit, so I made my research and I realised that it’s normal. However the blood kept on getting more after a bit it stopped and now I’m just bleeding a little every morning. I would go see a doctor but I’m on holiday so it’s a bit tricky.

Does anyone have any idea what it could be? Should I be worried?

Also I asked my bf to get checked just in case but obv that takes about a week and my period is coming in a week.

I feel so lost, I don’t know what to do 😔