This blood pressure of 135/90 is just marginally high as ideally it should be around 120 to 130/ 80-85.
There is nothing to worry regarding the minor fluctuations which occur day to day and moreover self assessment of BP may not be that accurate.
Blood pressure medicines take 10 to 12 days for proper action on your cardiovascular system.
Carry on with your medications and stop worrying as any anxiety
shall bring more fluctuations in your BP.