Bad idea for a number of reasons, and I definitely wouldn't say it is safe. Blood pressure (steroids plus a strong stimulant) is a worry, as well as the extra strain on your liver. There are probably a number of other risks as well.
You will also be setting yourself back on your cycle. You won't be able to train as hard as you should be for a number of days, and you'll also screw up your diet.
If you've started your cycle, you should be dedicated to your gains and health. Wait until after PCT is complete before taking anything - taking drugs whilst cycling is reckless and irresponsible.
Have you got your PCT all organised and ready to go?