Do you really "just know?"

Hi everyone! I'm VERY new to this. About to turn 31 and been ttc (learning new jargon everyday) since June. Started with ovulation kits this month, was ovulating 8/9/10th of this month. 
So many of my friends keep saying, "when it happens you'll just know. You'll feel it right away."
Has anyone else experienced this immediate feeling or is it just friends trying to make you feel better.
Because for me, it's not, because I feel nothing. It's just scaring me that we missed out this cycle...
Any conversation would be welcome!