The chances of you being pregnant are very very very slim. It doesn't appear that he went inside of you. If you had your jeans on, the semen cannot go through the jeans. Heres what a missed period can be a sign of: Hormone Imbalance
Taking certain medications
Large amount of stress
Improper Diet
And many others. The other symptoms you're having could be pure coincidence. Stress, certain medication, large meals, etc. cause bloating. And its not just a coincidence that the possible causes of your missed period are the same as your bloating. If this continues on for another few weeks, then seek a professional and/or take a pregnancy test.
But, I think you're completely safe.
~jamesish~