Any words of wisdom? Abit concerned there may be something wrong.

So I have my period very regular like on the dot every month!! Its usually 29-30 days, been like it for years. I noticed last month I only had a 24 day cycle which was really unusual for me, shrugged it off, but now this month I've missed my period altogether, CD 34 now, negative tests. Could I just be pregnant or could something be wrong??? Im a worrysome