Somehow, what Ive mostly taken in from this post was "I was already fully dressed before he spluffed"
Buy a test 2 for £3.50 in Asda, do one today, if its negative test again in a week. Then while you are at it buy some condoms and only let him splooge whilst you are fully dressed and not in any physicak contact unti he put one of these on.
Oh, and go get yourself checked out for any nasty diseases. Although i believe blue waffle disease is actually just a photoshop, its not worth the risk to get a hoohah thats not pink!