I am now 8 days late of my period....... help

I am now 8 days late of my period. Here are my symptoms. My cm is very watery.. my stomach is tighter then normal I feel like I'm 3 months.. I've been very very sleepy tired not wanting to do morning. Might or cramps here and there... lastnight I've had a Sharpe pain in my right pelvis. My breast have been very sore some Sharpe pain in my right breast not hurting as bad today but lightly tender. And my eriolas however you spell it around my nipple is very dark. If I take first response now would it work. I went to doctors yesterday took a pee in a cup test it was negative. Doctor said it was prolly to early to tell