pregnant or not?

Hi! On Nov 1st, my Implanon was removed and I started the pill right after. We weren't supposed to have sex in the first week, but it happened several times anyway. Last Thursday was my last pill, and I still haven't gotten my period, so I'm already a week late. Could I be pregnant? I took a test 2 days ago and it was negative. But I know from experience that I get pregnant quickly. A year and a half ago, I stopped the pill and got pregnant the very next month. Unfortunately, at 11 weeks we found out that our baby's heart had stopped beating. We went to the hospital for a D&C. Three months later, I was pregnant again with my daughter, who is now 8 months old. Is it possible that I'm pregnant again??