Very petite moms??

Any other ladies very tiny pre-pregnancy?  I'm 5 ft was a prepreg size 0.  Now 24 weeks and already feel like I can't take it much longer.  Ligament pain is so bad and my belly feels so heavy and tight like it's going to pop.  I'm not even that big it just feels that way...and my bladder is under constant pressure.  I just think there's not a lot of room in there!  Wondering if this is common and if I might struggle to carry full term?  Tbh I'm kinda hoping I deliver a few weeks early cause it's so uncomfortable.  Would love to hear from anyone with a similar experience.