I'm so confused!!!!

So AF was supposed to be here yesterday according to this app and Sunday according to another. I went all day with no signs of her except some minor cramping and then I get home from work and have very very little brown discharge like hardly anything so I'm thinking ok here she comes. Well, today rolls around and still nothing! Still only very minor brown spots but that was this morning nothing since then! I've felt very nauseous for the last couple of hours and cramping on and off again! I took a cheap test last night and this morning and both negative! I seriously have no clue what to think of this! Anybody else ever been in this boat! I want a baby so bad I'm trying not to get overly excited but it's so hard!