You sound just like me. I haven't been preggo in a while (mom of 2 boys) but I do know that both times I had no clue I was preggo until I missed AF. I don't remember feeling sick before but at the same time I wasn't looking for symptoms either. But as soon as AF was late is when almost instantly the nausea, headaches, sleepiness and super sore nipples started. I didn't even take an HPT because I knew as soon as AF was late. I did get implantation spotting one time but it was actually the day after AF was due because I remember getting excited thinking AF was finally here but she wasn't :-)
It's funny that now I'm ttc I have every symptom in the book starting after ovulation.
I have one daughter and all I can remember with her was constipation. I didn't have morning sickness or anything until well into my second month.
i wasn't paying much attention the month we got preg, since we had really given up hope and i thought everythign was from the progesterone! but frequent urination and constipation were the two most different and fist symptoms i realized.. then sore nips, not like the typical pre-AF breast soreness, and then right before 6 weeks Horrible morning sickness which i was so thankful for Any and all symptoms though! : ) cant' wait for them again hopefully!