My OB was conservative and took me off at 12 weeks but immediatly put me on gestational diabetes treatments. I did the 4 finger pricks a day and followed the deit for the remainder of the pregnancy and it worked perfectly.
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I just posted this the other day. I took my last dose on Monday (at 12 weeks) as per my OB and was freaked out. I emailed my RE to confirm that it was okay and I just got a response saying that there are many schools of thoughts on when to stop but all end up with the baby being fine, so to go ahead and stop taking it.
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Re: Going off metformin at 12 weeks
Two Mc Peas In a Pod
Kayla's Grace
TTC#2=July 2011: Surprise BFP: Chemical Pregnancy