Congrats to you. It does not matter how faint the line is. The fact of the matter is the hormone is there and it's been detected. Your hormone levels will double and triple in the next weeks to come. You boobs will probably get sore. Mine were not horribly sore but they were sore, I did not notice them getting huge right away like others, but gradually they became much bigger and at 20wks, they are plump. You may also notice you will get up at night more often to pee. In the first couple of months you will average 2x per night. Now I am at least 4x if not more...no fun.
Other than those noticeable changes right away, morning sickness does kick in..for me it was around 6th week. It did disappear by the second trimester, but I will pray you will not need to know what it is like. I never felt pregnant or anything happened right away. Even when the morning sickness was there...I was so nauseous but I could not throw...I felt just sick. But as the weeks went on, I tried paying attention to everything. I suggest buying the book "What to expect when your expecting"....I believe the author is on her 3rd edition and it has every question in the world and month by month follow up. You'll enjoy it.....
Best of Luck to you...Congrats again.
Kim