at 18 weeks I wouldn't even stress the previa. Call your doctor if you are worried about the cramping. I had TONS with my previa, and I was bleeding.. I found it at 15.5 weeks because I was bleeding heavily and went to the ER. I continued to bleed/spot for the next 3.5 weeks, but at my 20 w us the previa had completely cleared.
90 percent of them clear up on there own and there is no need to worry about the previa aspect just yet. :)
As for the cramping, call your doc/midwife and ask. *I* wasn't worried about my cramping and pressure because it was normal for me, and my issues. You know your body. If you feel something's off, call!
at 12:45 PM on Mar. 20, 2009