Yes, both the stress of worrying, and an abrupt stoppage of the pills could affect your period, make it late, early, heavier/lighter than usual, or even cause you to skip it all together.
If you used the condom properly, your chances of being pregnant are very slim, so if it were me, I would just wait it out.
Usually, even though you stop the pill, it is still in your system for awhile, for some people as long as 3 months or more, however some people have body systems that flush it out right away, so they miss one pill and get pregnant, while others can miss several and never have a problem.
Unless you start showing unusual symptoms that point to pregnancy, no need to worry.
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My information is not guaranteed correct. I do not get them right all the time, but I do enjoy the hunt~