You were laying on your side at an angle where it looked like you were laying on your stomach when Geto and Shoko busted in and flipped you onto your back

Shoko: GOJO YOU CAN'T LAY ON YOUR STOMACH BRO.

Geto: YEAH...IT'S NOT GOOD FOR THE BABY...

Suddenly someone knocked on the door and when Shoko openned it, it was a guy with multiple boxes of mochi

The guy: Here ya go. For Satoru Gojo.

Bro tossed that big heavy box at you and it hit you in the STOMACH...your stomach was now completely flat and the baby just stopped moving