overactive bladder postpartum?

Hannah
I had a UTI/kidney infection that lasted me about a month... After finally getting on the right antibiotic it has supposedly cleared up. I have the azo test strips and I use them quiet frequently to test my urine now. They have shown no sign of infection. I do not read the results after 2-3 minutes, but when I look at it maybe 5 or more minutes later the color changes. I tried it with just well water and it does the same thing after that long as it dries out. Anywho. I'm three almost 4 months postpartum and I literally still have to pee ALL the time. But if I'm up and about doing things I don't have to pee often but when I'm just sitting at home I feel like I have to pee all the time.. Maybe I'm just thinking about it a lot. But I feel like I have to pre all the time now... I don't know if this is a postpartum thing or what... Anyone else have this problem? It's driving me crazy!! 
Help please!!