Low blood pressure, cause for concern?

My blood pressure has always been normal, around 120/80. I'm now 15 weeks pregnant and just took my blood pressure and it's 80/60. I'm feeling fine, not dizzy or anything. I do have a headache but it's probably unrelated. I read online that because the blood vessels dilate, blood pressure drops during pregnancy and reaches its lowest point in the middle of the second trimester. Should I be concerned? I'm going to call the doctor in the morning but I want to make sure this isn't something i need to rush to the hospital for.

UPDATE:

I ate a bunch of salty food, drank a Gatorade (Gatorade has a lot of sodium) and drank lots of water and my blood pressure went up too 106/60 👍🏻 My headache instantly disappeared.