Hello, if i took alka seltzer plus twice while 11 weeks pregnant is that ok? or should i do something now to (combat/reverse it) that? thanks

Should be fine,,,: This is highly unlikely to cause any effects outside its intended purpose during pregnancy, as it is made for general consumption. Also you only took it twice so any effect it might have would be minimal, and would likely be over with. So it would most likely be unnecessary to do anything to reverse it, other than not to take anymore if it causes discomfort. Best of luck.