Breastfeeding and feel pregnant!

So I have a 6 month old baby that I breastfeed and have not yet had my period return. My husband and I had unprotected sex about 2 weeks ago and a week ago I had a streak of light pink blood when I wiped and nothing since that. Now my lower abdomen has been sensitive when I press on it and I just feel off. I took a test this morning and it was negative. Since I don't know if I ovulated (since my period hasn't returned) it's really confusing! I know there's a slim chance of getting pregnant while breastfeeding but I'm scared I'll take a test in a week and it'll be positive! Has anyone here gotten pregnant while breastfeeding?