I'm suprised the prune juice didn't help! I suppose it's because you're still on the antibiotics. Anyway, I would think it'll start to do it's job when you're off them. I also wanted to add that orange juice really does it for me! I'm normally not very "regular", but in my last pregnancy, I craved SO much orange juice, and I went at least once a day! You might want to try that, if the prune juice doesn't work for you.