Hello , I Need Help. My Last Period Began On

Hello , I need help. My last period began on 12.3.2016 and my fertile days were 21.3.-26.3 through these fertile days me and my husband had sex every day. In 26.3 I was to the Gym and when I was home I had little pain law in my belly. When I went to the toilet I said some blood which was very well visible. After this I had only brown liquids and then nothing. My liquids now are normall. Is there a possibility to be prwgmant ? May I go to the gym tomorrow ? Thank you in advance