HELP!!!!!????

I had a positive Digit (clearblue) opk on 1/11/18. I should be 12 dpo now - cramping, increased creamy white cm, sore boobs, you name it. However I have had BFN (first response) for the last 3 days now. Im supposed to start AF in 2 days - and my symptoms are still the same, however morning in the shower I had a large amount of egg white clear cervical mucus. Out of curiosity I took a digital opk test again and it was positive! I can't be ovulating a second time in my cycle without having a period yet can I? Or could this mean that I am pregnant and the First Response test is just not picking up the HCG levels?!? I'm so confused, please help!