What does this blood mean

J
Hey guys I've just finished my fertile week today but am unsure if I actually ovulated or had implantation bleeding? I have never ever bled mid cycle before in my life and this cycle on the 10th (which is 13ish days after me and my partner had unprotected sex) I started spotting the colour was a brownish colour, I've had mild cramps and headaches on and off (odd) I've also had dizziness and not feeling super flash, and I've been just wanting to stay in bed every day and not do anything! Today is the 12th but last night (the 11th) my spotting practically stopped and me and my partner had unprotected sex again, and after it I've had a lot of watery blown looking blood (not enough to soak up through a pad though but it was still there, I'm not sure if this mean I was ovulating (there for what are my pregnancy chances?
Or if they are implantation bleeds (yesterday afternoon I got a beg test but my period isn't due until the 25th) 
What do you think this could be?
what do you think I should do?
Do you think I'm pregnant already from the 31st?
Do you think I was ovulating and concieved?