period problems 😩

Okay so my period was late by a couple of days (2-3) this doesn't normally happen. When I went to the toilet yesterday there was blood so naturally I thought this was my period, I'd been having stomach cramps too so I just didn't think anything of it. But since then there hasn't been any blood at all, this has never happened before and I'm a little worried. Is this normal or should I tell someone or am I just completely overreacting and panicking?Â