If all your previous periods were on time, then this is quite unusual specially if you were having all the signs of pregnancy
. I would like to know how your period is going? is it like your previous periods or you are bleeding in a different pattern? If there is a change you might still be pregnant, specially if you still have the symptoms. In that case you should consult a Dr personally for examination and investigations. If your period is otherwise normal then it may just be a delayed period because of some other reasons & should not be a cause of concern. Take care.