so I felt a tight feeling in my vag.....I'm scared

thank you, I'm just scared because I've been through one miscarriage and it would kill me if I go through another one

http://www.zliving.com/health/pregnancy-babycare/4-weeks-pregnant-ready-set-grow-2465/

Everything is swelling and shifting. It's mostly normal. If it gets too strange, I'd talk to a Dr. but I felt tight down there, too. Your cervix has closed and everything is out of whack. I think you're just fine.