Thank you, i was checking the voltage on ATmega328P 16mhz 5v when pin was set to high, and it was oscillating between 3.7 and 4.1 V
It should be safe for 3,3v tolerant output/input modules connected to the atmega, but i cannot be sure, that's why i'm asking.
In Atmel world things are more complicated sometimes for someone like me working with Microchip till today 
So can I assume, that connecting directly for example pin 14, or pin 2 of arduino pro mini to be used as TX with Softwareserial library (version ATmega328P 16mhz 5v) to the RX input of my bluetooth module HC06 (that is 3,3v level input) should not burn the module ?