late but negative?

Paula • I`m 33 years old, married to my best friend and soul mate and we have a 6 year old daughter. Ttc for our 1st child together

Hey ladies! I've been TTC for a while now and this month my period didn't come as expected. As of today, I'm 5 days late. But...I've taken 4 pregnancy tests and all 4 have been negative. 2 were the little strips that come with ovulation tests when you buy a bulk of them and 2 of the tests were First Response. Have any of you had this happen? If so, did your period start or were you pregnant? Thanks for any advice and answers!