AF 5 days late & TTC

Alicia • ? Ooo Eee, Ooo Ah Ah, Ting Tang, Walla Walla Bing Bang. Ooh Ee oo Ah Ah Ting Tang Walla Walla Bing Bang!! ?
Hello ladies,
​Hoping for some advice or even if one of you has had a similar occurrence.
​Im currently on CD 35, i generally have a 29-30 day cycle thats come like clockwork with tender bbs & bloating 3-5 days before af arrives. ive been ttc for just over a year now without success. Partner & i have DTD every 2nd day from Af ending on Sept 4th, experienced some odd dark brown spotting on Cd 18 which has never happened before which only lasted a few hours if that (sorry tmi, teaspoon amount visible on panty liner & when wiping, also small traces still visible next morning) and again on Cd 29.
​Have had some 'bubbly' feelings in the stomach starting around Cd 22 - now & Dull cramps on & off since then. Also have been EXTREMELY tired, and cant seem to stop eating, according to my partner ive been quite moody also, but not feeling bloated or having the usual sore/rock like bbs as i normally do before AF arrives. 
​i have taken 3 hpt's on Cd26, 29 & 31 all being Neg ? wondering whats going on, this never happens!! Though speaking to my Mum & she never got +hpts until she was well over 2months pregnant with all 3 of us kids.
​I don't chart temps or take opks either, im not really an addicted poas person. I have moved states but that was before last AF so i dont think the stress has put me out from moving. 
​WTH is going on? Comments appreciated