Yes, pregnancy is possible. Any time you have sex, even if you use protection or the morning after pill, pregnancy is possible. No form of birth control is 100%.
The morning after pill can throw of your period, so that's a possibility. Of course, pregnancy can stop your period too, so that's also a possibility. We really can't tell you what's going on, it's impossible to do online.
Wait until your period is at least 2 weeks late, then test using first morning urine. If that test is negative, wait for your next period and if you miss it, test again or get a blood test done.
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