Hi My Name Is Kate I Am 22 And Married.

hi my name is Kate I am 22 and married. My husband had a vysectomy 10 years ago he is going to be 34 On September 17th. yet i have been having pregnancy symptoms for the past 5 months I haven't had a regular period since december of 2015. It is now may. I have had 4 positive home tests for pregnancy. Yet when I had my primary physician run test on me they came out negative. I know I am. But no one will believe me. I have felt flutters of movement inside me. my abdomen keeps getting bigger every month. My doctor says i am just bloated. I urinate every 30 mins. Have experienced brown and pink light discharge, fatigue, lower back ache, swelling in my ankles, feet, and hands. My bras and other clothing just don't seem to fit like they use to. I'm getting stretch marks, I am always thirsty, having food cravings, had nausea, dizziness, vomitting. I am still having trouble getting comfortable when I sleep and having very vivid dreams. i just don't know what to do, I mean I've been taking Prenatal vitamins with folic acid just incase since I can not seem to convince my doctor. I have read on line that this has happened to other woman online but then again you can't believe everything you read. So I was wondering what you think I should do? My period tracker application on my phone says I am 21 weeks and should be due September 20th 2016 and should have conceived on December 26th 2015. I was just wondering your thoughts on this. I mean is it an ovarian cyst causing my irregular period or pregnancy? Any Thoughts? I am very concerned for my own health and if I am pregnant the well being of my child.