Got a BFN this morning which I expected but I did the test anyway

Came of BCP in December, had period in December and in January and none since, earlier this month I started to chart temps largely out of curiosity. The temps suggested ovultaion and me now being 13DPO and due AF on Sunday but I really don't know whether to trust that, why would I be there now? I'm not sure I really believe the temps and am thinking I'll go to the doctors next week if still no AF. I'm also hoping for AF, I just want the confirmation that I'm not pregnant so I can move on and continue to try. I'm on cycle day 71 for goodness sake, my periods were regular before BCP and I have no symptoms of there being anything wrong with me. I know it's not abnormal but I'm fed up and frustrated by this, really frustrated. Blah!
I want a
I'm also wondering if I should not be TTC as my partner proposed this week and we're planning a wedding now! We want to do it in the next 12 months (he said he doesn't believe in long engagements) and are looking at November, do I really want to be heavily pregnant at my wedding? I don't know. I don't mind being a bit pregnant, we hadn't planned a big church and fuss type do, just registry office and something in the "cheap and cheerful" category (actually I don't even need that, I'm happy going to the registry office any day and taking a witness of the streets if that means we're married!) so I am all confused. I also look at how long it takes people to concieve and think why not just keep trying anyway, probably wont be pregnant by November anyway!!