During sex if the condom breaks, & he does one stroke of sex. what are my chances of pregancy? my last period was on april 13 .

Not zero: If the condom breaks, it is as if no condom was used. Some semen can leak before a man has an orgasm. This is why early withdrawal doesn't always work. By 4 weeks after your last period you should be able to do a urine pregnancy test. Read the instructions to be sure when to do the test. Not all tests are equal so look at more than one test.