Blood pressure and 35 weeks pregnant

I just got home from the doctors office. I’m 35 weeks+1day pregnant. My blood pressure has been really good throughout this whole pregnancy until this morning. They told me my blood pressure was high and wanted to see me back in 2 days. Is this something to worry about? I’ve been on bed rest for a little over a month due to pre term labor.... what can high blood pressure cause in pregnancy? Is it normal? I just want my baby boy to be healthy and perfect.