I Have Constipation And I Am 26 Weeks Pregnant But

I have constipation and I am 26 weeks pregnant but the problem is can we see the baby clearly with the help of ultrasound because I hadn't do poo 2 or 3 days... Any idea Doctor? And another is that after 20 weeks my baby is lying transverse position and can't see his face and gender.. Is the body parts fully develop or is this a problem or minor