With #1 I was clueless and thought my first episode of throwing up was food poisining.
With #2 since I knew how to chart, even though I wasnt, I was still paying attention so I knew pretty much when I had ovulated, and within a week or so got queasy, almost like motion sickness.
Now, with #3 it was planned and we were hoping so I was paying attention. Three days after Ovulation I had really achy pain in my left side, by day six I was nauseated, exhausted and depressed (and had a dream about a baby). Day seven I slept 12 hours then woke up sleepy, irritible and just snarly. Day 8 convinced me because a rash popped out on my arm that I hadnt had since being pg. with #2. Also, I was really hot for several days along with the feeling of motion sickness. Day 12 I took a test and got a positive that was so faint I wasnt sure so I went and bought the first response test and got another very faint +. But there enough to be sure. (The first test showed nothing at first and I had tossed it and gone back to bed, but later it had a faint pink line, but the directions said not to read it after that long so I wasnt sure it was anything, thats why I bought the other test, which came up immediately pretty much).