Plan B

So last week I took plan b after protected sex because I thought maybe some got in me. And I took the pill days after having my period.

Period ended 4/15

Had sex 4/19 -second day fertile window.

Now it’s a week later (4/26-today) and my lower back hurts and I started spotting and having what seems like my period again??? I’ve had this “period” what it seems for 2.5 days now

There was enough blood to need a pad yesterday.

Am I pregnant???

Did plan b work???

Or is my insides just messed up from taking it???