I would not be at all worried by those numbers. They are in a good range
You do not mention what the diastolic pressure (bottom number) was short after you started your medication.
Preferably the diastolic pressure is below 80, so your measurement is a bit above it.
To get a good impression of the actual bp you need to do several measurements and take an average of them.
Adding medication to lower diastolic pressure will also lower your systolic pressure which is already quite low. I expect that your cardiologist will not change your medication