late period

Oh my goodness ladies.... I am officially 2 days late and I'm almost positive I'm not pregnant (only having sex 2times in a month can't do it, right? ). I'm hoping that it is just the stress of us being sick and taking medicine for tonsillitis or Akaias nursing. But it's the first late period I've had since December so I may be freaking out a little. I had just decided that I wanted to wait a year or two to add #3.