First pregnancy, worried about getting pre-e

This is my first pregnancy, I’m 30 weeks today and I have to do another 24 hour urine test. My midwives have been monitoring me closely and I’ve been having to take my blood pressure twice a day at home, I was diagnosed with gestational hypertension at 27 weeks and when I did my first 24hr urine they said my protein was 260mg and that 300mg is when they typically diagnose preeclampsia. My mother in law keeps telling me that me and my baby are going to die if I get preeclampsia and it’s freaking me out so badly (and raising my blood pressure 🙄) so I thought I’d come here and see if I can get some insight, is there anything I can do right now to possibly prevent preeclampsia or to lower my blood pressure (highest it’s gotten is 150/78 but it’s been steady at around 130-135/70s, it’s always above 140 when I go to the doctor) I’m just getting really worried now that I’m getting so close to delivery