False Negatives?

Hi!  I just turned 33 and my husband and I are in our first month TTC.  I had been on bc for 13 years and always had regular periods.  I tried to skip my period on our honeymoon in late October and it still came anyway so I went off at that time.  I have been so tired, some minor cramping, not like period cramping.  I took a test a week ago, First Response, and it was negative.  I took another one this morning as my period is now a week late, digital First Response, still negative.  My period has never been late and there is no sign of it as of yet.  Any chance it could be a false negative?  Thanks!