My wife and I think we may be expecting.

My wife is having the following symptoms on and off.

Fatigue, really tired during the day then at times struggles to sleep at night.
Sore breasts and sensitive
Feels just blah.....
Gets cranky by doesn't know what she is cranky at then becomes all cuddly
Sensitive/sore lower back
She is usually very regular however the last one only last for 2 maybe 3 days

Like I said these symptoms come and go through out each day.

We have taken a couple of tests but have been negative. Could we be testing to early? Are those symptoms consistent with very early pregnancy?