Ugh...Cycle Craziness!!!

Jamie • 34 y.o., TTC #1 since October 2013, tried 5 cycles on clomid early 2015, no luck just yet.
So frustrated...I normally have a 31 day cycle & I'm currently on CD 40, BFN & wondering WTH???
​Went off BCP's last Sept 2013, TTC since. Had one normal 31 day cycle, followed by long cycle 40+ days back in November. Since then it's been at 30-31 days like clockwork. Why back to the crazy 40+ day cycle now after 7 months of normal? Had PMS symptoms late last week, but no AF yet & multiple BFN's.
​I've been doing opk's & monitoring CM, getting positive signs of ovulation every month since November...no PCOS, no endometriosis, always normal pap's.
​Ready to cry, just wanna know what's up with my wacko system & this random long cycle after I thought my hormones were back to normal.
​I have an MD appt on the books, but wondering if anyone has any thoughts?