Question about pregnancy symptoms

For the ladies who have gotten their BFP or have children already.

I know it's a bit early (I'm on CD18) but I'm feeling weird today. I just wanted to ask, when you started getting symptoms, were they CONSISTENT or just on and off?

This morning my boobs are sore (a dull ache here, and a sharper pain there). But also my chest itself is aching.

I'm feeling light headed.

And I'm feeling slightly nauseous, but I do have a medical condition that can also cause nausea so I'm not bothering with that. Same with the fatigue, I have chronic fatigue so not going to bother looking for that symptom.

I've been having cramps on and off now this entire week.

We only BDed twice during my fertile week BUT we used Preseed this time (last cycle we BDed four times with no Preseed and obviously didn't get pregnant).

Am I crazy and just looking for signs that aren't there?