I waited until closer to the end with my first, and ended up being induced and pushed for two hours. Started at the end of the 2nd/beginning of the third trimester with my second and went into labor on my own and only had to push 4 times, so I think starting earlier helped that time. Maybe ask why your midwife is telling you to wait? (Might be related to a health concern?) My midwife just said to wait until after the first trimester to start taking it.