Confused

Ch
So I am due for AF today. Usually before she arrives I get cramps, mood swings, headaches and my pee is usually getting darker. (Weird but I notice). I've had none of these symptoms and thought maybe I was pregnant. I took 1 test yesterday morning and it was a BFN.
 I'm 12dpo. This app says I should have my period today but I just went to the bathroom and had egg white sort of CM. My partner and I haven't had sex for 5 days so it wouldn't be sperm. I'm just so confused.
Should I test again or should I just wait and see if AF shows up ? Do you think maybe it might've miscalculated and I could be near ovulation now? Any help is greatly appreciated x