possibly pregnant ?

okay sooo to mind you i’m on the younger side turning 16 soon . i had protected sex around january 31 or february 1 and i’m not on birth control. i’m educated on sex but im a very anxious person and need some reassurance . i ended up getting my period 2 days after but i don’t have regular periods ever and i just need some peace of mind because i don’t have anyone i can talk to . according to eve my next period should be in 9 days but they don’t ever come on time so i’m simply freaking out because i’m an over thinker. any advice ?