Symptoms

So ive been having headaches, back ache and I normally am not the type to get back aches on my period.. my boyfriend and I had sex about 2 weeks and a few days ago and I’m already 4 days late?? I’ve been having some interesting dreams and I find myself waking myself up because I’m laughing lol... at night I get really thirsty and two days befor my missed period I started seeing this new discharge... should I worry?? Or could it just be late period??