Late period

Ciara

Ok so my period is usually so regular, it almost comes on the exact due date or a few days before but I’m nearly 4 months late. Done a few pregnancy tests which all came up negative and I’m not getting any bigger weight wise and my boobs don’t hurt or anything. Has anyone’s period ever been this late? I’m starting to freak out like is something wrong with me or is it normal for it to be this late once in a while. HELP!