Pregnant???

Emily
I am now 20 days late and I took a pregnancy test on the 4th and 9th day late and both negative. I do not want to be disappointed again with a negative test. I have been off my bc for 4 months now and I have had regular periods since being off of it. My nipples are very very sore and have been for a week. I haven't had any spotting and I am having trouble with focusing. Should I take another store bought test? I need some help and insight. Oh I am 20 years old and married for 6 months.