Whether you gain or lose weight over a small period of time, there is a chance that you will get stretch marks. In fact, stretch marks can also be caused due to genetics, so there isn't much you can do.
Getting rid of stretch marks completely is virtually impossible. What you can do is use make up to cover them up and keep your skin moisturised to reduce their visibility. Also, you should try and avoid sudden changes in weight so eat healthy and drink lots of water.
Finally, you shouldn't worry too much about them. A lot of people have stretch marks and they are probably more worried about their own skin to notice yours. Be confident about yourself. Good luck.