I'm not sure how long it was after conception since we weren't really charting, but right about the time my period was expected my chest was really hurting and sensitive. I had some light brown spotting the week my period was supposed to start, which I thought was my period. Other than that, I didn't really feel too different! I also took tests that were all negative the week before my expected period, so I was really suprised when I got a positive!
The only symptoms that I noticed was I had cramping a few days before AF was to start so I thought it was coming. I normally don't get cramps until the day it is to start. However, my DH just knew I was pg about a week before AF. He noticed that I was really tired all the time and taking naps and in the 3.5 years we lived together I maybe took a nap once and I kept wanting to take naps that week.
I also tested 4 days before AF was to come and got a negative so don't waste your money testing to early. It will just get your hopes down. DH thought we were out that cycle so he didn't believe me when I got a positive when I was a day late and he had to run to the store to buy two more tests to make sure.
ETA - I was charting and believe I O'ed on day 16 and felt the cramps on cd 26 and felt tired around cd 22. I usually had 28 day cycles
I felt nothing out of the ordinary, whether that be a blessing or a curse. I had no unusual cramping, no m/s, no fatigue, etc. I was shocked when I got my BFP and would have bet crazy amounts of money that cycle was a bust. As hard as it is, try not to read into anything or else you'll drive yourself crazy. Many "symptoms" early in pregnancy can easily be AF symptoms as well
My period was a few days late, so I immediately took a pregnancy test and found out. I didn't have too many symptoms right in the beginning, but soon after I took the test I started getting nausea on and off. And I was getting tired very easily too.
Of course everyone is different, so you may experience something totally different. I do regret drinking on a few occasions before I knew. So something to think about for sure.