Is anyone else getting different due dates when using different websites/apps? My usual period calander app has me at 4 weeks 6 days but some other apps like glo and what to expect has me at 4 weeks 5 days. Which one should I go with? I have my first appointment on the 24th , I also had a miscarriage before this at around 5 weeks so everything has me on pins and needles but trying to remain positive!