Worse at 12 weeks?

Lizzie • Baby #1 "Smalls" 10/13/15. Baby #2 due 04/15/19
First 11 weeks pretty okay! Tired, emotional and some constipation but pretty good. Then all my Apps start saying I'll be feeling better starting at the 12 week and now I'm feeling worse! Super super tired, no nausea but other bad stomach issues. Uhg anyone else get worse at 12 weeks? The first day of the 12 week I felt like I woke up with a hangover.