Cycle buddies AF due 10/4 still BFNs

Hi everyone. i've been ttc for 4 months. AF due 10/4 but until now (10/10) still no signs or symptoms of AF or pregnancy. I have regular 29 cycle day and never late before. Tested on the 4th, 7th, and 10th all BFNs!

I'm worried now.

Is that normal? Is it possible i'm pregnant although still BFNs?

Update:

Just found out this article.

http://www.babymed.com/pregnancy-news/hcg-levels-and-gender-fetus

It says If women carrying a male fetus have lower hCG levels then it may be possible that their first positive urine pregnancy test could be delayed because of the male gender.

I'll be very happy if that's true since my husband really wants a son.

I pray for all of us here this will be our month..

I will test again next friday 14th..

Update:

I had light brown spotting without any cramp on 10/10 and 10/11. Not sure if it's the sign of AF or something else..