I don't know what hellp is.
I had PE with both of my pregnancies and they was 2 years apart. It doesn't always happen more than once and if it does it sometimes happens later in to the pregnancy.
I started to get PE at 33 weeks with my first pregnancy and 36 weeks with my second. I'm pg with #3 and i am hoping it won't happen again but will keep you updated if it does.
I think the best thing to do is talk to your Dr or a OB about it.