flow was good for one day, then small with white blood?

hi i just wanted to know if im pregnant ii and my fiance where having sex for 6 months or so and during these past three months im using oral contraceptives then its the start why my period has change it does not come on exact date same a s before and my menstrual flow has changed this month i have my period but the regular flow w as just good for one day and the remaining three days the flow was just like the white blood and it was just really small i would like to ask what does it mean if i am pregnant or not pls im just looking for answers im so worried about it cuz i still have one year to go before i finish my studies just want to seek some help if it means that i was pregnat or not hope can u help me and looking forward for ur ansre thank u