Steak (tmi) please help. Lol

Okay so I've always enjoyed steak. It's pretty much my favorite food of all time. I've always eaten it medium.. My whole life. About a year ago I noticed that every time I went out and ordered steak I would immediately have to go to the bathroom and have excruciating cramps / cold sweats and diarrhea to the point where I thought I was going to pass out. The first few times I thought it was just food poising, then the way it was cooked so I tried medium - well and then eventually well done ( since I'm pregnant now ) and nothing helps. Every time I consume it, straight to the bathroom I go. I DONThave this problem with ground beef  ( I eat it daily) or any other kind of meat. The cut of the steak also doesn't matter .. Sirloin, filet.. All the same.. Does anyone have any answers as to why this may be ? I'm starting to get concerned.