I Took Morning After Pill On 11/07/2015 And My Periods

I took morning after pill on 11/07/2015 and my periods were due 21/07/2015. I have not gotten my periods to date (19/08/2015). Could i be pregnant?

For the past two weeks i have been struggling with nausea, bloatedness,stomach cramps, vomiting, food leaving bad taste in my mouth, headache, lightheadedness, are those signs that i could be pregnant as all these signs started after a weekend of excessive drinking