I’m scared that i’m pregnant

I am 17 and had sex for the first time with my ex boyfriend about 5 days ago and we started with protection but it was causing issues so we took it off and he pulled out both times he finished. Well about three days ago we had sex again and used no protection or pull out method. it was really stupid. i took plan b 2 days after and i am just so stressed that it didn’t work. 3 days ago i started very lightly spotting. it’s something i’ve never seen before. i looked it up and it said that can be a very early sign of pregnancy but i feel like it might be to early for that. i don’t know i’m just very stressed and don’t know what to do next.