Plan B

so i had sex w/ my boyfriend while on my period & we had an accident 🤦🏻‍♀️ i took a plan b 3 days after & then i was done with my period 2 days after but now out of no where its been 4 days since i finished my period & 6 days since i took the plan b but now i am am spotting so im so confused & scared b/c i don’t know wtf is going on.