You should talk to your provider about the change. There could be many reasons (weight gain, stress, increased salt, change in a medication or supplement, etc…) but could be an underlying medical problem. Do not ignore. Ignoring it can lead to other problems.

You are correct to record your blood pressure, because that is first thing they will ask.
Make sure record date, time, which arm, blood pressure reading and notes about anything that you thing maybe effecting pressure. Some websites suggest measuring blood pressure in both arms.

Is there a chance that your home blood pressure machine is inaccurate or has changed? Is there some place local that does free blood pressure checks? Then can compare your machine to another. I have a blood pressure check with nurse this week and they suggested bring my home monitor with to compare readings.

Do you have ability to send message to provider or nurse to ask about the change without traveling to an appointment?

Laurie