Pregnant

Ok so I need to know if anyone else has had this problem, I went off the pill in April. My periods were normal. July I had very light not a lot of bleeding wouldn't call it my period. August I missed my period. All test were negative I took. September I seemed to have a normal period and was disappointed. Until yesterday I took a test just due to frequent peeing and one in the morning and one at night both positive. But after speaking with a nurse I'm worried. She says we should due a blood test. I guess the difference would be like 2 months vs 3 weeks or a false positive?? Does this mean I might not be be Pregnant or I'm just further along?? HELP!!