Without Taking A Pregnancy Test How Would You Know If You Are Pregnant?

I doubt that him fingering you after he jacked off would get semen inside of you, provided he washed his hands off or at least wiped them off. The common symptoms for pregnancy are as follows:

Missing your period
Vomiting
Dizziness
Nausea
Severe mood swings
Unusual cravings for "food" (if you can call it that, considering how pregnant women warp it)
Your hormones go out of control

I'd recommend getting a pregnancy test from a drug store or your local convenience store, however, just to tell you for certain if you're pregnant or not.

Just for reassurance, however....

There are times in a woman's life when they can miss their period, regardless of whether or not they have sex (or use protection). It just means your hormones are unbalanced. You might not be pregnant, and if that's the case, then your period will hit you hard within the next month.

I would still highly recommend and urge you to get a pregnancy test, though. They're cheap and easy to use, so that should tell you whether or not your guy made a slip up.

...Sorry for the pun.