Please help! So confused!

Hi! Not sure where else to post! It's our first month trying to conceive baby #3! It was my first time using ovulation tests and I had a positive test on the 13th! We BD the 11th, 13th, 15th & 17th and of course random times after that! TMI but last night after unprotected sex, when I got up and everything leaked out there was some light pink blood mixed in with it (not from my husband). My first thought was maybe implantation bleeding?? I have no clue! Lol I never had it with my other two. Anyway, I'm supposedly 9dpo today & I took two tests today.. a cheap Walmart one and a digital first response! Both were negative. I'm a little discouraged and confused! Any insight? Thank you!!