2nd baby symptoms

So my first child (with my ex) was 6lbs 8oz  and a healthy pregnancy all around. This time around, this pregnancy (with my husband) is so different. This one worries me. I understand that when you're pregnant, your muscles stretch in your uterus and all of that, but I've been having this CONSTANT pain/ache since last Friday and it's mainly in the middle and left side of my pelvic area. Its a sharp pain when I bend over, when I lay on my side, when I cough, and when I go to the bathroom. No pain if I push on it though, just pressure. It's weird.