Has anyone else experienced this..?

My periods are so all over the place. The longest I've gone without is 3months (negative test)and the dr said give it another week and if you don't start come back. I ended up starting. Now here I am again.. No period in 7 weeks so went to dr took a pregnancy test cause my discharge had light bloodiness to it but not enough to wear a liner it was only when I wiped. It last 2 mornings wasn't an all day thing either of the days. It's so confusing. My boyfriend of 6 years and I aren't preventing pregnancy and would t mind if it happened but we're not trying either. If it happens it happens. What should I do..?