I'm currently 23 weeks pregnant. Is it safe to go to schlitterbahn? Can I ride tube rides?

Absolutely NOT !

Agreed... best not the schlitterbahn or tube rides where there are any drops/slides. Stick to the easy, relaxing rides where you just float along, and remember to use sun screen and stay well hydrated with drinking fluids. Do be sure to get your doctor's or midwife's okay first since we don't know if there is anything in particular to your pregnancy that may prevent it all together.