Maternity clothes

Brittany
This is my second baby. My first baby I didn't wear maternity because I didn't gain any weight until my last trimester. I'm 16 weeks tomorrow and I feel huge. I'm typically a size 18 in jeans and I went shopping today for maternity pants and all seemed tight or just didn't fit me right..... Anyone have any suggestions? And yoga pants isn't going to work since I'm not allowed to wear them to work.