Thoughts are appreciated!!!

Lexi • My fiancé & I have been high school sweethearts for 6 years. Wedding planned for May 14th, 2016. Both 22yrs.
So my emotions are definitely on edge today. My fiancé & I are high school sweethearts & have been dating for 6 years. The thought of having a kid has crossed our mind but we both really wanted to wait till after we get married. The wedding is planned for May of next year (2016). My period was suppose to come about a week ago & I still haven't gotten it. My period has a history of not being normal & I can sometimes be late but still get it. I woke up last night & had to run to the toilet to vomit, I've been sick for a couple weeks & have been extra tired. So I decided to take a test. I used clear blue & on the first test it came out positive. However in the instructions, it says to disregard the test after 10 minutes. After 3 I completely walked away & didn't come back till about 15 minutes later in which time the test went from not pregnant to pregnant. My first thought was panick. So minutes later I took another & it came out negative but I feel like I didn't take the test right (didn't pee for 5 seconds) so I'm wondering if it actually worked. Any thoughts or anyone else who has experienced something similar? I'm a little panicked only because the wedding is 9 months away & well if I just got pregnant.. Thoughts? Advice?