We were only truly trying this past cycle, so I definitely didn't expect to get pregnant so quickly. I had been charting for about 3-4 months so I knew roughly when I would ovulate and how long each cycle was (34-35 days). I knew when I ovulated, and didn't think much about it until about 6-7 days later when I felt some cramping.
Since I almost never experience cramps, even during my period, I felt like that could possibly be a sign of implantation. I continued to get cramps in the evening for a few days (and still do) and also experienced extreme fatigue a couple of days, was pretty gassy lol, and had sore nipples. I just felt different, but of course wondered if it was "all in my head." My husband was totally convinced I wasn't pregnant, because we just expected it to take a lot longer.
By the time I got my BFP at 10 dpo, I was starting to notice an increased sense of smell and sore breasts. I had quite a few symptoms, but I know there's a lot of women who don't have many symptoms at all and still get their BFP. :) It's different for everyone. And everyone has a different "normal."