I had sex with my fiancé on the 2nd of May, on the 5th we attempted intercourse again but I was having a lot of vaginal discharge that was white and smelled of urine, on the 7th and 8th I had light bleeding that was brown and light red. Then a week later I started to have red bleeding that lasted for a day and now I am having sore breast and they seem bigger. I've also experienced fatigue and flatious. Could I be pregnant?

Yes you could be, but without an HPT NO ONE can be sure.
Have you missed your period yet ?