If I haven't had un protected sex in 5 month and I had un protected sex to day am I likely to get pregnant if I don't a STD?

You can get pregnant if you have protected sex. No birth control pill or no condom is 100 percent effective. Condoms can have failure rates of 3 to 10 percent.

So you can be pregnant if you have any type of sex.

The number of times before in last 5 months does not matter, each time is a new time and new chance.