How early can you get gestational diabetes? After a 10.9 lb baby at 38+2 last time, the hospital are sure I had undiagnosed gd, I had a no of symptoms which I had told my mw but she just dismissed them. (am normally a size10, if that matters). I know they test at 26 weeks, but I think I may have it already and am only 13 weeks. Or is it just me worrying over nothing, any thoughts greatfully received as am seeing the consultant on Tuesday.