27 days late on my period and i am freaking out someone please helllllp!!!!!!!!!!!!!!!

So I'm going to start from the beginning. Make it long story short as much as. Since February 2nd I had been complaining my stomach hurt was cramping really bad lasted for a while like that too. I knew that Monday February 4th I would be getting my menstral. So I thought nothing of it. But weeks started going by then by Thursday February 20th I started getting really bad cramps but once again no menstral I've already took 3 pregnancy test and a blood test and all came back negative. I haven't had an pregnancy symptoms but my stomach cramps bad here and there and I feel uncomfortable and heavy at time in the lower region. I am now 27 days late on my menstral and I'm freaking out here I really don't know if I am pregnant and it just wasn't detectable at the time or not. Please if anybody has answers let me know I'm really worried and scared to talk to anybody about it.