AF or is it???

Amy • 42yo pregnant with #3. Due 3/9/15.
I was 2 days late (6 days late according to Glow). when AF started on 1/25 with bright red blood in AM.  Didn't even fill a light tampon and now there isn't any bleeding at all.  Previous tests on 1/22 and 1/24 were bfn.  This is weird..what does it mean.  Might test on 1/29 if AFdoesnt return.  Let me know if anyone else has had a cycle like this.