How can I make these contractions stop or get more regular?

I am 37 1/2 weeks pregnant with my second child. I have been having contractions for 3 weeks now. Very weak and crampy like that aren't making much change. I am about 75% effaced and 1-2 cm dilated. The contractions I have been having are somewhat regular about every 10-15 minutes, lasting about 30-45 seconds. Basically all day and night, there isn't much I can do to make the stop or get stronger and I am getting frustrated with it. I wish my body would make up it's mind already. My doctor seemed to think I will have him this week, which I don't mind to keep him in a little longer but I am getting worn out with this constant pressure and the contractions. Like I said they aren't strong, just enough to make me uncomfortable. I have walked, bounced on my yoga ball,and used my breast pump to try and get them closer, also I have showered, laid on my side, drank tons of water to try and make them stop. Nothing has worked to do either one... Are there any other tricks I can try to either get this to stop or get stronger and closer?!?