when to do a hsg?

Melissa
Hey ladies,
I am wondering when you decided to do an hsg? How many cycles had you been trying? 
I am on cycle 4 and I'm pretty sure I'm out. I'm 11 dpo and Af is due on Sunday or Monday.  I took a test this afternoon and it was negative. I know it could totally be too early so I'm holding a glimmer of hope. I've only had the weird shooting boob pains as a symptom for the last couple of days. No other real symptoms. If af shows I'm thinking an hsg might be a good next step but don't know if I'm just being impatient. 
Thank you!!