Well my baseline BP was never that low, but when my BP readings started jumping around last pregnancy my MFM said it meant I was headed for pre-e again or chronic hypertension later in life. Or both.
In your shoes I'd call the doc this morning and update them on your new symptoms of swelling moving into hands and shortness of breath. And see if they want you to come in sooner to get checked out.
Shortness of breath can be caused by something common like asthma (for some women it is worse in pregnancy, and a doc could check your peak flow). Or it could be a symptom of pre-e / pulmonary edema. Or even something more rare like peripartum cardiomyopathy (Which can cause fatigue, shortness of breath, cough, & difficulty breathing lying flat). Or it could be baby getting bigger and pressing up on diaphragm. In any case I know that I'd feel better if a doc listened to my chest/ lungs and I could get another 24 hour urine to see if my proteinura levels were ramping up.
I hope this helps, good luck.
Hypothyroid mom to Connor and Claire
(severe pre-e at 38 weeks & "mild" pre-e at 37 weeks)
& baby Annabelle
(chronic HTN & GD, superimposed pre-e @34 weeks, induction @37 weeks)