okay my friend ended her period the 1st of this month and she had sex the 11th and she has this period calendar and it said she ovulated on the 10 and was still fertile till the 11th. they didn't use a condom at first but then they did and it broke but he said he didn't ***. she took plan b step 1 2 days after. then on the 16th she had sex again they didn't use a condom at first and then they did. she hasn't gotten her period yet.