Hmm. Questions questions

So ladies, I have a very weird question. Today, I am 13dpo. I keep getting negative. A couple days ago, I started getting really sick. My fever flew up to 101.9. And I still have body aches. Today when I went to the bathroom, I whiped and had brown discharge. Which never happens right before my period which is due in 2 days. Would it be possible I ovulated later and go pregnany and I'm getting implantation bleeding? I have slight cramps but its not bugging me. Should I test again or wait?