Is this weird?

My blood pressure is always low. But it normally stays at around 90/50 and my heart rate is usually around 70-80. I'm 26 weeks pregnant and have been very short of breath in the past couple days and every time I check my bp it's been staying around 110/70 and my heart rate 90-115. All taken at resting pace. Maybe I'm reading to much into it? I will occasionally get chest pains but mainly just short of breath and have felt dizzy at times too.