35 weeks, low BP

This is my third pregnancy so by now I know that feeling a little "off" somedays is completely normal. For the last 2 days, I've just felt off. Overly tired, on and off nausea, headache, blah! So today it still hadn't gone away so I went to Rite Aid and did the blood pressure machine...and there it was-- the reason I've been feeling so blah! 98 over 43! I went because I was worried about high BP, but NOPE...diastolic was super low. Ate a big, salty mid-morning "snack"...and I felt so much better! And my BP was back to normal, 116 over 63. It's crazy the things our bodies do!