ive tried not to post too much on here about my symptoms as i end up getting obsessive and then feel even more disappointed when AF arrives

But, what i am experiencing this cycle i have never experienced before.
According to everything, i ovulated on CD23 this month so i knew AF would be later than normal (last month my cycle was 28 days). im not sure how long my usual luteal phase is as ive never been sure of ovulation before, but i am now CD35 and still no AF. The latest ive ever been is CD35, so if AF isnt here by tomorrow this will be the latest ive ever been in all my time having periods. Anyhow, for the past 4 days i have had really bad AF-like stomach cramps and low back pain, its a real dull ache like a "drawing" feeling, and i keep running to the toilet with a tampon as im convinced AF has arrived! (sorry tmi) But everytime i do, theres nothing. i keep feeling wet down there too but all there is is all this watery stuff coming out of me. Ive never experienced anything like this before. Normally as soon as i feel these cramps AF has started. Yesterday they were so bad i had to stay in bed with a hot water bottle.
I spoke to my friend and she said she got exactly the same thing when she was pregnant. Im trying not to be too hopeful as i really dont think this is my month, but im worried it could be a sign of something else being wrong, as surely its not normal to have cramps like this days before AF?
sorry ladies just needed to vent