Maternity wear for curvy petites

Ch

I'm looking for under the belly jeans, casual pants (not leggings) or shorts that won't gap in the back, aren't 9 miles long and don't cost a lot. I'm a petite pear shape and having trouble finding a good fit in the waistband. Pre-pregnancy I had an itty-bitty waist and large thighs. I find when pants fit in the thighs the waist is gaping in the back and a belt just doesn't sound good right now. Any luck?