I have finished my periods on Friday. I have protected sex on Friday and Saturday. And on Wednesday I feel bloating.. can I be pregnant.which I don't want to be.

Yes, you can be, but the odds are against it. Not knowing what protection you are using, each have a failure rate ( no protection is 100 percent)

And only you may know your most fertile times if you track it.

But could you be yes, any time you have sex even with protection, there is a slight risk.