dccw, Your arousal fluid is clear. It is blood plasma that is squeezed from the cells in the vaginal wall when you get aroused and vasocongest (swell up).
Unfortunately you do not provide any context: Do you use condoms? Do you use a lubricant? Does this happen every time? Is it possible that you can have an STD or bacterial infection? Do you have any smells? How do you know it is not his ejaculate? Does this happen when you masturbate? Did this happen with other partners? Is the fluid wet? Slippery? Thick? Thin? Creamy?
Your cervical mucus can mix with all the other sex fluids. This should however only happen for about a week and a few days every cycle.
There are some thought that fluid from the Skene's glands can actually come out through the vaginal walls, and not the urethra. The Skene's glands are the source for female ejaculation. This fluid is white and sweet but should nit be a 'quite a lot'. A teaspoon or two at most.
There are also 4 gland openings that produce differing amounts of fluids in the vulva floor. The Skene's glands next to your pee hole and the Bartholin's glands next to the vaginal opening. The purpose of these fluids are not known. It is thought to be anti-bacterial and lubrication. Especially the Bartholin's glands fluid will end up in your vagina.
Take care!