Roller coasters at week 5.5 of pregnancy

Dawn
I'm 5 weeks pregnant. The placenta hasn't formed yet - just a yolk sac. I'm planning cautious roller coaster riding with family that doesn't know I'm pregnant yet, in 2 days. Placenta abruption is the main cause of coaster riding. I know this park, and which ones toss you and shake you. I plan to choose mild rides - am I missing facts? Please no nasty comments, facts and nice words only. 

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