Help me out here, please.

I'm not due for AF til the 8th. DP and I have been fairly relaxed while DTD and only been using withdrawal.

So, after a week of sickness (not sure if was carsickness, as we were travelling around TAS at the time), incredibly sore boobies which had some milk in them after I squeezed my nipples to check, so emotional, crying for no reason, falling asleep anywhere (which is not like me). DP and I were convinced I was pregnant. I did a test, but was negative. I thought that was because it was 11 days before AF was due and was going to test in a few days.

Anyway, I've had some bright red bleeding today. Not sure how much, as I just stuck a tampon in straight away because we're at FILs at the moment.
Enough to freak me out. I don't know if it's implantation bleeding, something's wrong (no pain at all, just got a shocking case of man-flu), AF is early (which it has never been 8 days early), or if I was pregnant and it didn't 'stick'. I don't know what to feel at the moment. I'm hoping that I'm not having another m/c, I only had one 2 months ago.

Any ideas, please?