Is it normal...stomach aches after being horny

A few times this has happened.. and i just wanted to know if its normal.
When i start to get horny i always make me and my boyfriend stop whatever we're doing. Normally by then ive got a bit wet and what ive noticed is that afterwards i get stomach aches. Just making the point we havent been having sex.

Do i get aches because i make us suddenly stop? Is getting stomach aches normal?