Trying to conceive

Hi ladies I'm just wondering me and my partner are trying for a baby and I'm 4 dpo and I'm been haveing server bloating and back ache my cm has been creamy/pva type but I'm not due a period until te 12th I got a clear blue today and it came back not pregnant,ino they can test upto 6 days early I was just wondering my 6 days will be on Saturday will it still come up negative because I'm to early or would it definitely be a no,my friend said if I wa pregnant it would still say negative because I'm test 8 days before my period,sorry if this dosent make sense x