False Negatives? I need input please.

So hears the deal i hav'nt had a period since the last weekend in febuary (24 or 26). On the 27th of march i had i tiny spot of pinkish red, so i thought it was coming, it never came. And no more spotting either. So that same week i staing getting a lower back ache didn't think anything of it and had that for week and half. March 30th started getting mild cramps, and have had cramps off and on since then, April 2 my boobs started aching My nipples are sore and boobs look fuller, also felling bloated in lower abdominal area, pants are hard to put on Nothing fits! And i feel like im constanly peeing, i used to work a 4-5 hr shift w/out using the bathroom, n now thats immpossiable it feels like pressure, have to go almost every hour. And i can only seem to wear soft sports bras. Sorry but i also checked my cervix for clues n it was soft and pretty sure closed. Its driving me nuts i've taken 6 test (but a couple dollar store tests also) only 1 EPT that 1st week in April, and 1 FIRST RESPONSE April 6 that were all NEGATIVE. I need some options im scheduled for a blood test next tue, but anyone else who had false negatives? P.S. my cyle is never late!