I do not think you are pregnant. If you have had intercourse during the time of your periods, then there is no chance that you could get pregnant as there is no fertile ovum in this time.
Your symptoms are vague and could occur even in the absence of pregnancy
. Please relax, nothing to worry for now. Wait for your next periods to happen normally, which you should have ideally.
The blue veins
on the breasts are due to breast engorgement
phase, it is normally seen as well.
Hope this helps you.
Wish you good health.