The 3rd of this month was yesterday...
That said, yes, this would be around your fertile time of the month. The pull out method is not really considered birth control and can be really risky - both for STDs and for pregnancy. You have a few options, you can take Plan B if you feel you are at risk for pregnancy. Or you can take a test when your period is late.
You will need to see a doctor and get checked for STDs in the meantime. And never, ever ever have sex without birth control and a condom if you don't wish to be pregnant and/or get something.
(there is no test for guys who have HPV. So he could have been tested for STDs and still have that one. Nice, huh?)