Am I pregnant?

Kim

I am really confused at the moment. I have not had a proper period since April when I had a light to medium flow for 3 days. I didn't bleed at all in May and spotted for 6 days in a row in June. Nothing again since then. I took a test in May which was negative. I am not sure if I am pregnant or weather my body is just going through some changes. I am 28 and had regular periods up until January this year.