Is it normal to have some bleeding after an hour and a half of walking ? My OB recommended 30 min a…

Is it normal to have some bleeding after an hour and a half of walking ? My OB recommended 30 min a day and I think I over did it ! .. Last time when I did 6 hours of CPR when I was 4 months pregnant I bled a bit too .. And my doctor told me to take it easy 🙈 anyone else experience anything like this I'm currently 25weeks 4 days now