I m 31 years old, 5 3 180 lbs., had an IUD paragard inserted in 2011. I m 31 days late and I ve taken two at home pregnancy test that came out negative. I ve had cramping and acid reflux symptoms, could I pregnant or what is the reason for the missed period. I also checked for the strings and don t seem to feel them. I have an appointment on the 30th, but am worried.