What's going on???? Am I in or out?

😳 I'm really confused!!!!!!!!!!!! Please bear with me on this. 
When I went bathroom this morning, I wiped and it was watery pink. 
Thinking AF started I put a tampon in me. Take kids to school, get home, have cup of tea, pull out tampon, it's got bright red blood on it (why I think period is here) covered about 25% of tampon but not enough to make the tampon swell up. Just on the outside. 
So I put another one in. 2 hours later I pull it out and it's just the top bit, which has both red and brown blood on it. Been an hour without a tampon or pad and keep wiping and checking but nothing there. 
Any ideas? 
Positive opk on Sunday 8th march, BD'd on 9th march. 
Would prob have ovulated either Monday 9th, Tuesday 10th or Wednesday 11 if I ovulated late. 
Have taken a hpt and it's negative. 
Has anyone had similar? 
Thank you.Â