It does sound like low bp. One thing that can help low BP is wearing compression stocking or socks
(like the hospital gets you to wear to prevent blood clots)
And caffeine can raise BP, but check with the doctor about that first.

Definitely get checked by your regular doc, he/she will most likely have record of what your normal BP is.
With super low BP the risk to the baby is similar to high BP - lack of flow through the placenta.
Yeah, that...