implantation bleeding or late AF?I'm

SO and I havr been TTC for 4 months. AF was due to arrive in the 3rd.On the 2nd, I wiped and it was light pink, and then a second time later in the day the same.. after that nothing. Today still nothing. I took a pregnancy test and negative. But still no AF..No signs of it either no bloating no cramping..just horrible headaches. Could it be my horomones levels aren't strong enough to appear on a test yet or AF is being a bitch and messing with my head? Have any of you gone through this and turned out pregnant? I know everyone's different, this doesn't normally happen with me though..Any thoughts?

I swear, everytime I wipe my heart beats so fast hoping I don't see red... When I do I just want to cry. Instead I just yell the f word. lol