What Causes White Thick Creamy Vaginal Discharge After Sex?

Hello. I have been sexually active since last February. I am confused because I have been sexually active and haven t gotten this before. Since the night after my sex, I have been getting white creamy discharge. Very thick. Since then everyday I ve been getting less, but today I had some. I am confused because some say this is the semen being released out— but the condom was used properly and did not break nor did he ejaculate. I just want to know if I should worry. I am young and can t handle a child, getting stressed out. I am not on birth control because of a blood deficiency. Thank you thank you!