Could Lighter, Irregular Periods And Nausea Be Indicative Pregnancy?

Hi can you please help me I m not sure if I m pregnant or what I ve been feeling nausea and sometimes vomiting every day after my supper at 19h00 and my cycle has changed from April I usually see my periods for 3days and they were normal But as from April its 1 or 2 days and they are lighter or pinkish Brownish and my cycle used to be 25/26 but now it can be any day after 21days Is there any problem with me