12DPO Are these preg symptoms?

Hi ladies,
I'm 24 and never been pregnant, so except from the little things I've read I don't really know what to look out for.
Are the following pregnancy symptoms?
- Tender Breast & very mild pains through side of boobs, almost like a mild burning sensation but only last a second or two.
- Low backache, mild. Comes and Goes since last night.
- Mild headaches since yesterday morning.
- A little more gassy than normal.
I did a test about three days ago and was negative.
AF is due today or tomorrow.
What do you think girls, would really appreciate some info/advice/opinions.
Baby dust 👶🏽