Again...?

 So my period was late last month by like ten days.. ended up getting af late but went to the doctors, she said I was fine she isn't sure why I was late etc. well my period is never really late and this month I am having the same issue, except my period is now two days late. I'm not going to test for this late period yet because last time I was late they all came negative, followed by af. So my question is, has anyone had similar situation and fell pregnant? Or is my period and body doing something new here. Should I test anyway? Any advice or stories help!!! Thank you!!