I think it may be.

I have an intense fear of getting pregnant. Like SUPER intense. To the point that I have spent weeks crying because I don't keep track of my period and I think that I'm going to have kids but haven't had sex. (It is very illogical) It took me like four years to stop believing I was going to have a kid even when nothing has happened. I didn't get mock-sickness, but I did get intense anxiety. I think you may be onto something, though.