Another month another failed attempt

Kristina
I'm sooo frustrated. Ttc for 8 months. Doctor says we're both gtg. I got the ovulation test kits and made sure we did the baby dance at the right times but AF came 3 days early... I'm starting to feel defeated. I just don't understand, I was a teen mom and got pregnant with twins but now when I want to be pregnant it's so hard
​Any advice??? 
​35 me 46 dh
​I have 4 daughters 15, 17, 19, 19
​This will be my husbands first