Hey ladies! Quick question. I'm almost 15 weeks.. For the past 2-3 weeks I get moments of what I think is uterus tightening. I can feel my uterus at these times as it's hard. No cramps or bleeding or back pain. Episodes last about 3-5 seconds then go away. Not happening frequently; 3-4 times weekly but some days 3-4 times. Is this normal? It's my first so I'm not too sure thanks!!