Do you think i should be worried?

Ok i have a problem.. two weeks ago i went on the pill (Yasmin) but had to come off it last week because of serious health problems so as normal i got my period again and had unprotected last night.. my question is.. should i be worried about being pregnant now even if my cycle has been mixed up? its too early to do a pregnancy test so just wondering do you think i should get the morning after pill??