Pregnant women are advised to have the flu jab as the mothers immunity is naturally lower during pregnancy and therefore can be more vulnerable to the effects of swine flu.
As with all vaccines, whether you choose to have it or not is entirely up to you and is something that if you are worried, talking through with your GP. They have all your medical history to hand and will be able to make an appropriate opinion for you.
Here is the link to the NHS page regarding pregnancy & swine flu.Pregnancy & swine flu
I can find no research or data that relates to specifically to PE & swine flu.
I hope this helps
Every Woman is entitled to understand what happened in her pregnancy when pre eclampsia strikes. I hope to be able to support that process.