Missed period

Hey guys, I just wanted to know if this has happened to anybody else before:

The last time I had protected sex was in May, and my period has been regular, I got it in June and July but all of a sudden in August it just never came. I'm not on birth control.

I've been experiencing some intense cramping in my lower abdomen but no sign of my period... I'm not sure what to make of this, since I know for sure I can't be pregnant. Idk. I'm a little worried 😞

Thank you I'm advance 💖