Everyone is different, with my first pregnancy i didn't have any symptoms or dark line or breasts hurting or anything. But I'm now pregnant with my 2nd and I'm 33wks and was having lots of symptoms. Now later on, i have nipple pain in the mornings, bigger and darker nipples, the line on my stomach and acid reflux and pain in my legs. So i think you are okay. Everyone is different, you are lucky right now.
Thank you in the beginning my breasts hurt and I was so sick but lately it's been opposite other than the migraines..