Each Monday, I'd like to do a  highlights post , including a picture, summarizing the differences in my pregnancy from week to week.  I totally "grabbed" this idea from  Kelly .  I've done this with my three previous pregnancies (you can go to the search box and type in "pregnancy," or "week #" if you're interested in how my previous pregnancies progressed), as well, and I still think it is a great way to jot down the things that I don't want to forget later on.   Pregnancy Highlights: How far along :  15 weeks  Size of baby:   This little one is 4 inches long (top of head to tip of tailbone) and the size of an apple. Total weight gain/loss :  I'll see my OB next week, so I'll know how much I've gained this pregnancy so far. I was up 5 lbs at my last appointment.  Maternity clothes:   I purchased several cheap spaghetti strap shirts (think like $2 a piece) a size up from what I nor...