Ultrasound today

We had our first ultrasound today and everything came back looking great. We saw a fastly beating heart and a little lump in there (which is about what they look like at 7 weeks!)  We have a due date of around Christmas!  I’m very excited and feeling pretty good.  I have been feeling really dizzy which I gather from  Dr. Google is rather normal in the first trimester. Its been a little hard with  Jack running around and I just want to lay on the couch bc I feel so dizzy and my hands and feet are a little tingly.  They took my bp at the RE’s office today and it was 90/50 which is pretty low.  They told me to go home and eat something salty!  Anyone else have low bp and dizziness?