AF due tomorrow

Linzie • ICSI in Aug 2017 BFP - 12/9/17 - MC at 6 weeks 🌈 FET - 14/12/17 Baby Girl Murren born 1/9/18 💕
Been trying to conceive since coming off Depo in Feb 2014! According to glow I am 7dpo but this morning I had a blob of stringy egg white CM with some brown spotting through it so I took a OPK and it looks positive. I have had sore breasts and flu like symptoms for 2 days. 
Is this positive?