Help please

16 weeks pregnant .. Been kinda stressed here lately.. Got into a few disagreements with different people.. Ate a good bit this afternoon to though. Stomach is feeling extremely tight and stretched out and felt weird twinges in vaginal area and slight back ache.. Is this coincidence that I was stressed & that happened is this normal?? I had a really awesome day yesterday and today has been heck. Laying down resting now. But just wondering if anyone has had those symptoms and if it's normal