Cervix opened ?

Abby • Mummy-to-be 😍
I'm 28 weeks and asked my SO to check my cervix. He said it was open and he could put the tip of he's finger in. Should I be worried? Also I'm not sure if I've had Braxton hicks yet or not. This is my first baby. I felt some period cramp like feelings but not so much righting in the tummy