So since we're not Britney Spears anymore - what type of skincare should we be implementing ASAP to preserve any elasticity we have left? 
Should we be doing some extra moisturizing on tummy/breasts to reduce stretch marks? Recommendations on products?
Any tips from the ladies who are in 2nd or 3rd tri who may have a little more knowledge?
Me: 37 DH: 37 TTC since Jan 2012. RE consult and initial testing done in Aug 2012: SA fine, AMH 1.1 & HSG clear - on way to IUI but got BFP on 9/10/2012. m/c 10/3/2012 at 6w5d. BFP next cycle which was a c/p. IUI #1: Clomid 100mg 12/6= BFN. IUI#2 (unmedicated) Jan 2013 = BFN. Hysteroscopy 1/25/13. IUI#3 Clomid 100mg 2/23 = BFN IUI# 4: BFN. IVF #1 April 2013, BFP! EDD 1/12/14 with Boy!
Re: Skincare
Pfft, Britney isn't Britney anymore!
I do believe it has a lot to do with genetics. With my first (I had her at 32) I had NO stretch marks. This time, at 36... who knows WHAT will happen.
That said, I just slather on a ton of lotion and pray it works. I don't know if you've ever tried Lush Cosmetics, but they have a great selection of more natural, fabulous smelling lotions that I love to use.
I also use their Ro's Argan Body Conditioner, which is for the shower. My skin feels extra moisturized with it + lotion. It can be a little pricey, but every pregnant gal is worth it!
With my first, I just used any lotion I had in the house.
I had started out with a pregnancy-specific anti-stretch mark lotion and then started going between that and other lotions as even my doctor said there really isn't a difference between the specifics. The moisturizer itself should help in reducing chances of stretch marks.
A friend got me a bunch of ravel size bottles from Bath and Body Works, so I have fun choosing my flavors for the day.
Oh and best time to lotion up: right out of the shower/bath.
Happy Healthy times, ladies! We deserve the pampering.