Felt like I was going to poop while being fingered


Ok ladies this may be tmi but a couple of days ago I was getting fingered and it felt like something was going to come out of my rear end😳 I had to tell the guy to stop I didn’t want to have any accident he looked and said nothing came out lol but do you know why this happened? Has anyone felt that urge of something coming out the rear end?? It was so different and never felt that before. Plz need advice