I went to the hospital today after having bloody show of plug last night and then losing more this morning, they checked cervix and said it's closed but I have been having tightenings/contractions every 30-45 mins, and it's now beginning to hurt when I walk, I already had a lot of pressure down there as they've said baby is fully down but now when I walk I get shooting pains in my lower back and bottom of my belly, is this normal?