Hi, first, just to clear this up, pre *** always has sperm I'm it whether someone masturbates earlier in the day or not. And any time a penis is in our vagina, we risk pregnancy whether they fully ejaculate or not. However, it's less likely without full ejaculation and the timing sounds off based on your cycle. I can't really tell you whether you should take plan B or not because I'd hate for you to find out you are pregnant even though the odds are low based on what you describe. Plan B is hard on a woman and messes up our cycle even more. So, it's your judgment call about taking it or not. That's not a great answer, I know. I doubt you got pregnant from this but there is a small chance. :>(((