hi gpssim...
well bro..as far as I think only a single shot of xrays won't have any effect on either of the mother or the child..anyhow, ur gynae will be a perfect person to ask.
You knw doctors like surgeons, anaesthesiologists, even tech. assistant...these guys work in OT for more than 8 hrs daily...and work with C-arm machine, which produces xrays and they took multiple shots..while performing the procedure..even they don't get any bad effect...
xposure to xrays for a longer period of time can cause carcinogenic effect, but one time exposure is fine.
I hope this may help.
Johny