Pregnancy? Or not?

Daisy
Hi!
​I've not been ttc for 2 1/2 months but I really feel pregnant atm but I'm getting bfn?
​My symptoms are-
​*AF 4 days late when always on time
​*erect sore nipples all the time
​* extreme hunger especially first thing in the morning but then feel sick after eating even just a tiny bit of food
​* what could be a possible implantation bleed? It was just over a week before my period was due and it lasted two days and was pink then turned brown and then almost black! It was only slightly there in my pants and when I wiped!
​*ive been more gassy than usual 
​*ive put on unexplained weight? 
​* my stomach is bloated and hard and I've had cramps but different to AF cramps?
​What do you think? Could I be pregnant and my hcg is just to low to show a positive or is it all in my head? Even my partner has pointed out how erect my nipples have been the past week CONSTANTLY which is not my norm! And they are so sensitive and sore to touch! My period hasn't been late in years and I just feel pregnant of that makes sense? I've also been emotional over nothing at all! 
​What do you all think! I've got my fingers crossed I see a bfp soon!