Low Vitamin D @ 18w

pickle82

Thank heavens all our blood work came back great from the quad screen.  Except for my vitamin D had dropped from the first bloodwork where it was low. He says babies bones can be week from low vitD in utero.  Anyone else been told this?  Or know of harmful effects.  OB is putting me on a weekly vitD supplement.

Is this something totally correctable where I should be greatful for a good quad screen and just take my vitamin with a smile? 

ETA: I had melanoma this summer so sun isn't an option for me.