Sweetie I don't think you need to worry unless you're are bleeding or spotting and or severe lower back pain not caused by sciatica. I'm 25 weeks pregnant and this is my third pregnancy my personal opinion is that it's your uterus and pelvic area getting ready for baby I have had the same symptoms in all ofmy pregnancies but if you must ease your mind call the doctor or nurse on ccall for a professional opinion
You still having it? Is this your first pregnancy