my back and belly hurts

Yesterday while cleaning under the tables at work, I stood up and hit my back on the kitchen sink. For the time it hurted me but I ignored it and went straight back to work. I didn't think much about it until last night when I was out at my sisters place. My back still had a pain to it where I almost couldn't bare and my belly has a weird pain. I'm 30 weeks along and I'm worried that I might have hurt my baby. So far there has been no bleeding or leaking, the pain is just still here. Any suggestions or advice that can help me?