your blood pressure is totally normal, don't worry a bit! I know people say "normal" is 120/70, but truthfully, normal blood pressure can be anywhere from 100/50 to 130/80. Mine is regularly 100-110 over 50-60. Except when I'm at work, lol
Okay, so, here's the quick low down on blood pressures:
the top number is how hard your heart is pumping (systolic) the bottom number is the pressure when it's resting (diastolic). That's a really simplified definition. Personally, I don't get too concerned when the bottom number is a bit low, I get more concerned when both numbers are low (ie-the top number is below 100), or when both numbers are high (top number over 200, bottom number over 90), or when there's not a lot of space between them. (ie-110/100).
The other thing with any type of reading like that is that one reading doesn't mean much, it's always better to have more than one so you can figure out what your normal trend is. It's good to know this so when it does go up a bit, you can say that your normal is xx/xx.
here's my last bit-if your midwife/doctor/nurse tells you that it's normal and they're not concerned, believe them. And for the love of all that is holy, don't google stuff. Dr. Google doesn't know anything.