help.. am i pregnant?

[b] hey,
im 16 n i had sex with my boyfriend of 8 months a cuple of weeks ago. we used a condom, and have had sex about 6 more times since then. I was due on my period last friday (25th August) im late but its only been a couple of days. We’ve used protection every time and we are positive it hasnt split, can it stil not work? im not using the pill as im to embarrased to ask. also a week ago i had a bladder infection called cystitus, which ive taken medication for but it stil is there, could this have anything to do wit my period being late? or am i possibly pregnant? i am very worried, i dont want to be pregnant, im too young! please help anyone that is experienced with this… i really need help with this a.s.a.p! thanks everyone x