Blood pressure confusion/ how much is ur blood pressure in second trimester

I am 16 weeks 2 days today. Is it necessary to have ur blood pressure little low during second trimester? I have heard if ur blood pressure doesn’t stay on lower side in second trimester u have higher chances of developing pre eclampsia. On digital pressure machine mine is staying around 110/70. It is not very low. Manual machines shows more accurate result than digital one? Does didgital machine show lil lesser reading than actual? How much is ur pressure I. Second trimester?