7 days late 😭

E • Pregnant with baby #2 💗
I'm officially 7 days late on AF. I was due 5/1, I had light pink/dark brown spotting 5/3-5/4 so I took a test Friday and it was negative. I ovulated on 4/14 and we BD'd 4/14-4/17. Could the spotting I had possibly been implantation? And if I'm pregnant, is it just too early to get a positive? 
ALL comments help please! 😊