BFN but still not period...

Technically I have a day until AF is supposed to make an appearance, but I have a feeling she isn’t going to show. I haven’t had any period symptoms; no acne, no cramps, nothing. Now I’ve had nausea along with sore nipples, mood swings, slight back cramps and etc. I know these can also be signs of pms, but for me that would be unusual. Usually my period is early, but not this time. I took a test...

All of my tests have looked like this; ^..negative. Except for one. As soon as I took that one test it was positive. But every single test since then has been a BFN. What should I do? Should I wait until I’m actually late?