A friend of mine got the thick stretch marks on her stomach and its been about a year and now they just look like silvery lines on her stomach. She doesn't wear a bikini because they are obviously noticeable but I think it looks fine. I got the WORST stretch marks on my stomach! It honestly looked like a cat had attacked me they were bright red and ALL over but they were the thin ones. Well its four months later and I barely even notice them anymore. I'm not in any condition to wear a bikini yet (because I still have a little pouch I need to loose) but they do eventually fade and look a lot better.
Just depends on how much weight you gain.... Cocoa Butter is good to use now or I used the baby oil gel in the shower and it helped me with my 1st I only had a few and they were almost invisable after I lost the weight. Put cream on your belly and anywhere else you have "stretched", but do it religiously!!! And it should help! I wouldnt worry if you havent gained "too" much..... Good Luck