I would do nothing, tell no one, and go get a pregnancy test to relieve your own mind. If you ARE pregnant, I would make sure you are immediately doing all that you can- eating, vitamins, etc, to give your baby the very best start in life.

I would not begin imagining the next day, month, year, etc, until you know what is going on. Even then, I would take it slowly with distributing the news. There is plenty of time to tell people, you would have another strong 6 months, at least.

Go get a pregnancy test.