Been feeling super weird this week - would you take a test?

All this week been feeling strange. Absolutely exhausted even though I have had the same 7 1/2 hours sleep i get every night and work hasnt been as hectic as usual. I have had discomfort in my left and around area of my left ovary. Also felt very nausous with dinner every night during the week. I take yasmin, havent missed any pills this month so not sure whether to take a test just in case. Period due next tuesday. Any opinions or advice please?