AF late , BFNs!

Ovulation expected 14th-16th baby danced on 14th.

Had light brown spotting 25th and 26th.

4 days late for AF, creamy Cm and wet feeling (cervix SHOW) , full boobs with veins and hard nipples, backache.

I have been having PMS, pregnancy symptoms since 4dpo.

Why am I still getting BFNS is it because I spotted (possibly implantation bleeding) on 11dpo-12dpo.