Lasik in pregnancy is a common question! In summary - its best to delay any form of refractive surgery until at least 3-6 months post partum and after completion of breast feeding.
The main concern is that of changes to corneal rigidity due to fluctuations in pregnancy hormones. This may cause variations in the refraction which would of course affect the target of refractive surgery.
A secondary concern would be that of the medications used during and after the surgery. The systemic absorption of topical medications is low, and can be further reduced with maneuvers including punctal occlusion.
All things considered, you should of course discuss these concerns with your attending ophthalmologist, and together you should be able to get your surgery performed at the soonest date after your pregnancy!
ESG