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Even drop of semen is enough to get pregnant. The chances of pregnancy
will always be there even if you went to bathroom for urine or washing it after ejaculation.
I advice you to go for urine pregnancy test. The kits are available in all the drug store and is very easy to perform. Sensitivity will be more if you use early morning sample of urine.
The accuracy of this kit is about 98% and it should always be done after week of missed period.
Test will let you know whether you are pregnant or not, depending on that you can take the next action.
If your planning abortion
there are pills available but it always should be taken under the supervision of gynecologist. Never take this pill on your own.
Hope you have got the right information.
I advice if you are not planning to be pregnant it is better to use some means of contraception
Wish you good health.