You don't *have* to wear maternity-specific clothing. If it fits, wear it. Check out a lot of the babydoll styled tops in stores. For me, at least until about halfway thru my pregnancy (probably a little longer than that), I could get away with wearing certain styles of 'regular' clothes. Yoga pants were a total staple for me, too.
For 'maternity' clothing, have you checked out Kohl's? Also, some of the Burlington Coat Factory locations have a maternity section. I know the one in Cuyahoga Falls does. Middleburg Hts used to, but I don't know if they phased it out. Call first! And, most Target locations have some maternity clothing, too.
I also bought some maternity clothes at the kids secondhand stores around town. In Stow, Growing Years has a good selection in all sizes.