Jogging during week 6 of pregnancy

I used to go gym in the past. And during my first 2 pregnancy, I continued to go to the gym even when I found out that I am pregnant but it all end up with miscarriage at week 9 and week 6 respectively. After which for my subsequent pregnancy I stopped exercising the moment I found out I am pregnant and now had a wonderful toddler girl. Doctor said then that could be because I had thicker blood hence harder for oxygen to reach the feutus. He prescribed me with aspirin to support my subsequent pregnancy as well. Not sure if it is bcoz of the aspirin or bcoz I stopped exercising that helps, or both, but for my next pregnancy I would just stop exercising to be more safe.