In the state of Texas, pregnancy is not considered a "pre-existing condition" with health insurance. You can still purchase insurance with maternity coverage.
If you are looking for an alternative for a hospital, a birthing center is a great option for uncomplicated pregnancies. From beginning to end, with some labs extra, a birthing center cost under $5000 including the birth. Midwives have shown to be safer for uncomplicated pregnancies and result in less chance of a c-section due to less interference (ie pitocin and epidurals that cause baby stress) and less episiotomies.
I had both my kiddos at The Birth and Women's Center in Dallas, right next to Baylor Dallas. I loved the undivided attention the midwife and the birth assistant gave me and the environment was so calming.
I know that there is a birth center in Allen that is closer and I've had several patients use them, but I cannot speak of my personal experience there.
The website to the Birth and Women's Center is: www.birthcenter.net.
Hope this helps!