I'm 30w 2 days and since 11 last night I've been getting really bad lower back pain and aches/cramping and cramping and tightning in my lower stomach.... At first I thought maybe just Braxton Hicks, but now I'm starting to worry a bit. .. If I sit it will ease a bit, but that achy/crampy feeling is still there....I have a doc appointment on Thursday.... is this normal. .. What should I do?