False negatives?

I had unprotected sex and was about 4 weeks late so I took a dollar store pregnancy test. I just took one and it was negative but I heard those were pretty accurate. Now I am 5 weeks late and I researched some more and saw that some ladies get false negatives on the cheap tests bc they are not as sensitive. I don't have any symptoms besides a little mood swings and I feel fat? Not bloated just fat (could just be be being a fatass lol) and I been craving tacos (again me being a fatass) so do you guys think I should re test or wait. How long should I wait and what are the best tests