I Had What I Believe Was Implantation Bleeding A Week

I had what i believe was implantation bleeding a week before my due period. Then, no period when it was due, 2 faint positives the first day of said implantation and all negative tests after that. I have been having very low period like pain every single day since then. And still no period, a little sore breasts for a couple of days now.
Last period was 10/24 and lasted 3 or 4 days as usual for me, very heavy.
Ovulated between 11/06-11/09, supposed implantation happened 11/17 to 11/20, pink at first, then a few brown sticky spots, then pink again, then a little red, very very light in consistency and color and finally the lightest pink, all this only when i wiped, very little on my panty liner.
Next period due 11/22 (usually 30 day cycle) and missed.
Currently 20 days late and if i calculated right, i am on cycle day 50.
I have read many women's experiences where they would not show an hCg level until 2 or 3 months along or, not show it at all.
I don't know if i can get an ultrasound without showing a positive test result, so i am baffled.
This is/would be my first pregnancy and all the family history i can give, is that the women in my family all experienced implantation bleeding, so i figured it runs in my family.
What is your opinion?