I had a similar experience. My iron levels started to rise so I stopped taking them, they just made me feel so ill!
They took my iron again a few weeks ago and it was rock bottom so I've had to start on them again as apparently it could cause complications after birth but I've left it a little late to start taking them for it to make too much difference (I'm 40 weeks now) I'd definitely try alternatives as you've got enough time to try and raise your levels. Maybe go into the pharmacy and see what alternatives they suggest?
They took my iron again a few weeks ago and it was rock bottom so I've had to start on them again as apparently it could cause complications after birth but I've left it a little late to start taking them for it to make too much difference (I'm 40 weeks now) I'd definitely try alternatives as you've got enough time to try and raise your levels. Maybe go into the pharmacy and see what alternatives they suggest?