147 isn't too bad and your bp does increase towards the end of pregnancy, you might be ablento get it down through diet and rest. I have preeclamplsia and mine is usually around 160/90 with bp meds and doesn't go down with rest or diet. I had it witj my first too and he was delivered at 35wks when bp was 170/140. Take care and rest up, you're so close now!
I haven't experienced it personally but it's very normal to have higher blood pressure in the last few weeks. Since your bp has been normal all along, it's probably a mild case of preeclampsia and it usually goes away after labor & delivery.