as long as you are not bleeding i would say theres nothing to worry about, its normal to feel some cramping because your ligaments are stretching while your baby is growing. I was like that before i had my m/c i always get worried about everything, and my midwife told me that its normal as long as theres no spotting or bleeding.
Well i hope i helped you in some way. i wish you good luck on your pregnancy! take care and Happy new year! =)
yeah i had the same pressure feeling. im also 17 and im 25 weeks tomarrow. i called me doc right away they checked me out and my baby was fine, he said it was just my musles stretching and it's only going to get worse since its the first pregnancy. you should tell your doc about that though other then that i think your little one is fine! goodluck.