Omg help!

Okay guys so I know this is kind of a weird topic.. But omg, I'm so constipated.. I haven't changed my diet, I exercise 4 times a week, I drink a pretty decent amount of water .. I have no idea what's going on. But I'm seriously thinking of taking a laxative or something. This happened to anyone else? How did you relieve it? Did you eventually have to turn to a laxative?