I had some heavy bleeding with #2 for two weeks. I didn't get my BFP until near the end of that time frame, but I get notoriously late BFPs -- with this one, I got a BFN at 21 or so DPO and didn't test again until 28 DPO, when I got a BFP. I know from when I had sex and from ultrasounds that I was probably around where you are now when I finally did get the BFP.
My midwife was also not at all worried about it, and she didn't even suggest that I stop nursing my 6 month old.
I don't know what your schedule has been like, but I know that my bleeding dried up pretty quickly when I started to take it really easy, staying off my feet almost entirely for a week or so.