Nothing seems to be putting my mind at ease about this. I am 5 weeks exactly today and have had a very persistent lower achy back. I will occasionally have spasms in my abdomen if I cough or something but not a lot. I am so fearful of another miscarriage. All the dr will tell me is that "it could be normal." I don't know if I should be excited about this pregnancy or not

wish my dr would just do a sonogram.
Re: Achy lower back (all the time) With occasional abdominal cramps
I've had miscarriages and ectopics in the past. I'm also 5 weeks preggers now. My doc has been doing beta tests every 3 days to be sure that my levels are doubling like they are supposed to. Once my betas reached 1,000 they were able to make an appointment for a sono.. I go Tuesday. I think you have to have +1,000 beta levels for sonos.
I was also worried because of my past problems and because of horible cramping. Doc said it's all normal but I still can't help but worry. Make sure that your doc is reminded of your past complications and your concern and need for beta level tests to ease your mind and keep you from stressing.
Best of luck to you !