Upper abdomen pain 29.4 weeks

Kelly
This is the second time I have had this horrible horrible cramping feeling in my upper abdomen directly in the middle not more or less on either side. All I can do is lay here on my side. It lasts for about 3 hours. I had it on Monday and now again since 330 today. I already pooped. It feels like someone is sitting on the top of my upper belly. Baby is moving around just fine. Maybe baby is just up high and getting bigger. I don't recall its been 5 years since I've been pregnant. 
Anyone else experienced this?its not heart burn. Internet has done nothing but make me paranoid that its preeclampsia. I've never had high blood pressure. I am a little nauseous. It's not Braxton hicks. 
If it doesn't go away after three hours I'm gonna call my midwife.