W.M.
I just had this happen to me. When I was pregnant (about 6 mos) I had a regular eye exam and I got a new prescription for contacts. Fast forward a year, and I noticed that for quite some time I was having a lot of trouble with my contacts. I went back to my eye doctor and found out my contact prescription I got when I was pregnant was too strong. My doctor told me that if my blood sugar level was off at the time of my exam, it could affect my vision. After I had my daughter, my blood-sugar level stabilized as did my vision.