I keep track of my period through MyMonthlyCycles.Com. Because my periods are technically irregular, this helps me out a lot. I checked it monthly and would have my period starting either the day the site predicted or a couple of days before. So when I get a notice in my e-mail saying that my period is late, I'm like, WTF? (I've obviously neglected to pay attention recently) So I decide to wait a bit. Day 4 comes around and still nothing so I get a pregnancy test and at NOON (hormone levels are at the highest in the morning) that test comes out positive two seconds after it sat in urine.
TA-DA! I'm pregnant again. LOL. :)
At least I know Lily won't be the only child. :D