Is this a cruel joke or should I test again?

Hey ladies - I hope it's ok to post this in here - I didn't want to post in the "super fertile/pregnant in two months" groups. I don't have a BFP to announce but...
I'm in a position I've never been in before. I'm at CD31 and no AF. I am starting to get excited but my rational brains says, "girl, you're infertile and you guys couldn't do clomid or IUI last month. Don't get your hopes up."  We took last month off from intervention (had timed intercourse though) because I had 4 large cysts from Clomid and another ruptured a couple of weeks before. I had a laparoscopy on 8/15 and they found stage 2 endo and removed it. 
​On CD27 (5 days ago) I took a pregnancy blood test at my OBGYN's office and it was negative, as well as a home pregnancy test. I haven't tested since then because I thought there wasn't a chance. The blood test CD27 would be late enough in my cycle to be reliable, right?
I had a positive opk on CD12 and I think I'm currently 19 DPO. I keep feeling like I'm about to start my period (cramping, sore breasts) and every day I don't I'm surprised. In my three years of charting my cycles, they have varied from 23-29 days, usually 28 or 29.  Never 31. 
Have you guys heard of laparoscopy, cysts, ruptured cysts, endo, or Clomid causing cycles to lengthen? Should I retest? When should I call my fertility doc?
​Thanks for your help!