I had unprotected sex but took an ipill after 48 hours. But my period is late by 10 days. Can I be pregnant?

Nobody would know unless you took a pregnancy test. It isn't that easy to get pregnant. Stress, illness, weight, medication can all lead to missed periods. http://www.whattoexpect.com/preconception/missed-period/

thanks

Possible. Take the test to be sure