Sounds like a normal thing to me, just depends on the time of the month? But I remember early in my sexual experiences, thinking that the condom had broken, because there was some milky something on the edges of her vagina. Same thing.
You sound young, or at least somewhat inexperienced. May I strongly recommend
? My wife and I thought we knew a lot, but this book had a wealth of information that every female really should know, as should most males who associate with them.