How quickly did you know?

Brittany
So I have been tracking my cycles for 6 months and my husband and I finally started actively trying. I feel like I'm being a crazy person BUT our active first attempt was Sunday (4 days ago) and as soon as I woke up on Monday I just didn't feel right and still haven't felt "normal". I was cramping on one side of my lower abdomen Monday and Tuesday (it's since gone away but has been replaced with feeling bloated) and I am feeling unusally tired and not in the mood for any type of food. I'm hungry but I just feel loghtheaded and nauseous. Just trying to figure out if it's all in my head or if some of you knew and were right that quickly after. Any insight is super appreciated. Thank you!