It's almost too early for you to tell whether you'd be pregnant if you're only on day 18 or so of your cycle (assuming the 28th day 10 days from now is when you'll start your period) and you conceived only within the last six or seven days. You could get one of those early-response tests and take it, but you'd do just as well to wait and see if your period starts, then check after you've missed a period. (Assuming you do. Not everyone does.)

Sure, some of that could be from working out, like the muscle twitchy feeling, especially if you've been doing ab work.

My earliest signs of pregnancy were always sore boobs on top. Normally before my period, they're sore underneath, but when I was newly pregnant, they were sore on top instead, like the mammary glands were sending an early warning sign. I was also very very tired and sleepy, but that was after the first month or so. I never had much morning sickness. Just a mild feeling of queasiness, and that doesn't usually happen till the HCG hormone levels get a bit higher. I usually knew I was pregnant because we were trying to conceive, and days 11 and 12 of a 28-day cycle were always prime conception time. (Got pregnant six times, but five of those ended in miscarriages.)

Try to just chill and take a wait-and-see attitude. If you don't want an unplanned pregnancy one of these days, though, you might work on taking more active contraception steps. You know what they call people who rely on only the ovulation-timing method of birth control, don't you?

Parents.