New pregnancy after abortion?

Aniya. • Mommy to a little boy & happily taken ❤️

I got my first positive faint line yesterday. I’m not sure if it’s a new pregnancy or left over HCG from my last abortion. I used the pill on September 17th so it’s been around 6 weeks and a few days. Not sure if HCG would even stay that long. I already had my period and everything after the abortion and I had unprotected sex with my child’s father. I’m starting to think it’s possibly a new pregnancy. What do you guys think?