Late Odd Periods 2 Months in a row

Gina
Sorry if this is TMI! So I always have my period on the dot every month. So last month I spotted two days on 4/20 & 4/21 barely then it went away for 3 days then I had reg flow on 4/25-4/27 like normal periods for 3 days. 
Now this month I'm now late (5/24). There is nothing at all. All pregnancy tests are negative though. I'm just confused and wanted to know what you guys thought. I've had ppl tell me I could still be pregnant. I doubt it due to the tests though. 
Has anyone heard of this b4? I have NO history of irregular cycles at all as I chart it on a calendar and it's always the same thing every month like clockwork.

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