...and I've been cramping for about 2-3 days now

Woke up last night with DD and could have sworn up and down I had started. But went to the bathroom and nothing. Usually when I get cramps like that, AF has just started. Had ovulation spotting but no implantation spotting. BFN 11 and 13 DPO. Just waiting for AF to show her ugly self

Disappointed.
Re: 13 DPO...
Check out the 2WW thread. Posted daily, perfect place for this.
ETA: sorry about the BFN. I do get that it's disappointing.
Even if you did spot, you wouldn't be able to tell if it were implantation spotting anyway. The only way to even semi confirm this implantation bleeding is to get a BFP and even then, there is no way to tell, could have been just random.
And 13DPO is early. And ovulation spotting? Is that how you "know" you ovulated? Ovulation is another thing can't be confirmed by spotting.
DS #1 born 05/25/2012
BFP#2: 06/12/2013 ---- loss
DS #2 born 4/08/2014
BPF#4: 2/1/2016 --- 2/23/2016 suspected molar pregnancy--- 3/15/2016 D&E - diagnosis MM
BFP#5 - 9/22/2016
* formally bornmommy
Cramping doesn't automatically mean AF is on its way.
HPT accuracy DPO
10 dpo : 35%
11 dpo : 51%
12 dpo : 62%
13 dpo : 68%
14 dpo : 74%
15 dpo : 80%
16 dpo : 88%
17 dpo : 92%
18 dpo : 99%