Low Blood Pressure

I have been feeling really off lately. Dizzy, headache, exhausted, heart palpitations, and faint. I assumed it was pregnancy or allergies and just let it ride. Now, the symptoms are starting to get worse. The last few times I got my blood pressure taken, it was 104/54 and 104/52. The bottom number is out of normal range but my doctor didn't say anything. Anyone else experience this? Thanks!