Planned Parenthood is one of the premiere Family Planning organizations in the world. The service you'll get here will always be accurate, complete, and above all, entirely confidential. It's a little more expensive, but the services are some of the best around. If you just drop by, expect a wait of a few hours, but this can all be avoided by making an appointment! Click the link for more details.
HDHHS is one of the most cost-effective option out there (although Rice students should check Health Services first, since some of the services—like EC—are cheaper here). They're not that hard to get to, and their prices are very attractive, but as a warning, plan to wait quite a while for your services… We recommend calling first—it’s always better to compare prices, times, and level of convenience over the phone before actually going through the process.
Need a way to get to these testing centers? Try the Houston Bus system, they have convenient stops near most centers Houston Bus Schedule