Hi I've been ttc for a year now I got my + opk on sept 20, had sex 3 days before and then 2 days after, according to glow my af is supposed to be here today. I always get my af when glow says I usually get my pms symptoms a day in advance I haven't had any symptoms that af is coming. The only symptoms I have are bloating, gassy, headaches, lower back pain, and strong sense of smell. I'm 15 dpo and got a BFN. Any advice would be great