Sperm dies when it comes in contact with air.
You wiped and washed it off.
Your showing 'signs of cramps' because you are stressing yourself with this.
How old are you, periods are never 100% regular, that happens later on in our lives.
There's nothing wrong with a period coming a week earlier than expected.
Have you actually HAD unprotected sex? Wher your boyfriend finishes inside you in the past?
You are not pregnant. But you should get on birth control to aviod a worry like this.
Your just stressing yourself right now.