Hi My Name Is Monique, 15 Turning 16 In 2

Hi my name is Monique, 15 turning 16 in 2 months, I'm writing to inquire about my strange discharge lately. I've read around, and understand that it can differ from time to time but am still unsure. Ive had sex only about 4 times (3/4 time unprotected) so I'm worried this might be caused by a transmitted disease:/
To be specific, I've had small white clumps of discharge come out a lot right after intercourse (a few days ago) I'm also worried about getting pregnant, even tho he has never ejaculated inside me.

I would very much appreciate your time and consideration towards helping me