Hello,my Name Is Jodie I'm 17 I've Been Having Unprotected

Hello,my name is Jodie I'm 17 I've been having unprotected sex with my boyfriend for about 5 months now and recently had my period after being 3 days late I came off yesterday and now I'm getting brown and red discharge I'm quite worried as I've never had this before if you could help I'd be grateful Thankyou.