Need your advice ladies

I haven't been on ivillage for awhile and I can see this isn't a very active board but I'm hoping someone sees this and gives me their take on things.

My husband and I have 2 daughters and are not TTC.  However, AF didn't start today and I'm a little concerned.  Here's my timeline for this cycle:

Cycle Day 1 - AF, June 12

Day 12 - DTD, June 24

Day 16 - Day 21 - bloated, gassy feeling

Day 19 - reddish, brown spotting, lasted one day, July 1

Day 22 - took pregnancy test with FMU, BFN, July 4

Day 27 - no AF, today

What do you guys think?

Thanks!

Lindsay