I am 2 days late on my period was supposed to start Thursday today is Saturday and nothing yet.

I took 2 tests one Friday one Saturday both negative !? Can it be false positive? Should I buy another test another brand ? Those were up and up brand from target. I don’t feel any symptoms other than sore boobs. But I also didn’t feel anything with my first pregnancy so I don’t know what to do please some one help ya girl out what.