question about FRER

Em
Okay, I have looked at a lot of yalls posts and I was told myself to try a pink dye test. I got the frer and it said negative. So someone commented on my post saying be careful of the curved ones. Well, where I am they don't have straight FRER unless I'm not going to the right stores (Walmart, Target & MCC/NEX).  Does anyone know where to get a straight FRER? I don't want to be in the dark anymore. Af is due tomorrow, no signs what so ever of her. Crampy consistently for a week, sore breasts & sensitive nipples (sorry TMI), cravings that I don't typically crave, headaches & backaches. Soooo idk lol help a sista out! 
Baby dust to everyone :)