What does it mean when i have a feeling about something and it happens?

This happens lke 2o times a day and i have an extreamly fuzzy image,but mostly a feeling of somthing that is going to happen,weather its someone playing a trick on me or a warning thing or something that i feel that i should do someting and not do that or walk there to keep safe.Its hard to explain,but if you know what i mean,please help.