Horrible afterpains caused by exercise???

Sarah
I'm a FTM and the first few days after birth I had mild afterpains while nursing. Then they were gone and my bleeding had almost stopped as well- now 6 days pp.
Today I went for a 30 minute hike and as soon as I came back I started having horrible contractions! They lasted over an hour and were followed by increased bleeding. 
Anyone else have this happen?? My dr had said that being too active could cause increased bleeding but didn't mention increased afterpains.. 

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