The uti could be the cause of your pain. If you are really concerned about, don't be afraid to call your doctor. In regards to the nausea, it is nothing to worry about unless you can't even keep liquids down. Then you can become dehydrated. I had a constant nauseous feeling from week 6 to about week 18. I was also on medication to help with the vomiting...it helped with that but it didn't do much for the nausea. Hopefully it will get better for you soon!!!