Is there enough sperm in post ejaculation?

[DH117]

Hey, so this girl and I had sex October 8th and I used protection and didn't ejaculate in her or in either of the condoms and neither of the console were broken. Here is the part why I'm asking though... so after the first condom she gave me Oral sex and I ejaculated into a pair of underwear. I then gave her oral sex for about 10-15 mins and then when I went to put on the second condom I dried the tip of my penis off and pulled on the bottom up to get all the post ejaculation fluid out. When I wiped it to the point where I believed it was dry I accidentally put the condom on backwards for about maybe a solid 1 second and then I flipped it around. She was supposed to have her period the 29th of October and she still hasn't had it but she is stressing like crazy and I belive that's the reason why she is because about 3 months ago her last boyfriend and her had sex and she was 3 almost 4 weeks late on her period but she got it eventually. Does anyone know about post ejaculation? And how much it would take to cause a pregnancy?

[Danny S.]

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