hi there, all your symptoms are exactly like mine when I first suspected that I am pregnant. my last menses was 23rd Jan.
went to get kit tested faint line too, then tested on the digital kit and saw " Pregnant 1-2 weeks".so its very likely you just conceived 1-2weeks ago.
went to see a gynae, did a blood test and confirm pregnant. Gynae said I m very sensitive to my body. Guess its the same with your case.'
Breasts still very sore till now and starting to feel nausea. I am in my 5th week going 6th EDD 29 Oct.