Stretch marks

Maria
Ok, I'm only 4 weeks and 5 days but this is something that I'm thinking about and stressing a little because I take great pride in how hard I work out. Since I found out I was pregnant I haven't gone to the gym- that's my own personal choice mixed with a little fear but whatever. I've seen pictures of other women with crazy stretch marks and saggy skin in their stomachs and some of them have kids that are teenagers now. Is this something I should be worried about? I know it seems totally vain and stupid but yes, I am worried about it even if it is a little.