So many symptoms but still no BFP! Advice Please.?

I was supposed to start my period on Feb 15. Still no sign that it's coming. Been having a little bit of cramps, but they're different than period cramps. Also been having a lot of preg. symptoms like serious craving for milk ( i hate milk, now i'm drinking it from the jug), nausea (vomited one morning for no reason), tender and really swollen ( are popping out my bra, sorry tmi), bloating (can't fit in my pants that i did last week), always hungry, extremely tired, clear discharge, night sweats, dizzy spells. Took several tests already but all negative. Could I be having all these symptoms and still get a neg? Or is being desperate about TTC taking over my brain. Any advice please!