3 days late for period, negative test, slight cramping..whats going on?

I'm in the same exact boat..3days late today and still negative. Other women have been telling me that since I'm cramping the egg could be implanting. Once the egg has implanted it can take several days for the hcg to be high enough to show on a test. Waiting is torture but you should know soon enough. Good luck and lots of baby dust to you :)