Period cramps but no period??

Aja • Aja. artist, bisexual, single ❤️
So I'm on birth control and I'm supposed to get my period in 13 days but I have these really horrible cramps that feel like period cramps which doesn't make sense cause my period isn't supposed to come yet.. Is this a side effect from birth control maybe? I'm a little worried. Any help would be greatly appreciated!