Is Pregnancy Possible While Having The Normal Menstruation Cycle?

hi im too young for this and im scared to death with noone to turn too please help me...i have had sex for the first time with my boyfriend in mid january we used a condom, correctly as far as i know...but pregnancy is something im terrified of..and lately ive been getting symptoms.. i started my period on time at the end of januaury..or i think it was my period it was only heavy for about three days and carried on with spotting for about two or three days after, also after it ended i had more then usual clear discharge... all test have been negative except one acted like it was going to positive because the second lined turned white and acted like it was going to fill in but it didnt.. my next period should be at the end of this month and im scared it wont come please i need some answers. thank you.