Symptoms of constipation & abdomen pain

Hi everyone. Recently, i did a pregnancy self test and it is positive. Due to a past miscarriage experience which happened few months ago, i am worried about this pregnancy. So i fixed an appointment with my gynae although the date is less than 8 weeks since i missed my period. Then i started to have constipation and pain at my abdomen region. Is it a cause for concern? Should i push forward my gynae appointment? Some female friends told me they could be symptoms of ectopic pregnancy. So i am very worried.