Starting to get me down

Rachael • I am 23 years old, I have been with my partner for almost 4 years in july 2015 and we are trying for our first child.
A week today I was due my af, Saturday (3 days late) I took a pregnancy test which came out negative. Yday with no sign of af I decided to take another which came out positive but very faint so I decided to not get my hopes up and test again in the morning( which of course I did and I tested again late at night on same day) but that came ouy negative so I did another test this morning which again was negative and now im having very light pressure cramps. I dont know if its wishful thinking but these past few days ive been having nausea, major heartburn, dizziness and major hot flushes. Its so confusing and upsetting id rather just have a bfn and af then a false reading. What do think? Am I wishful thinking?