i have made unprotected sex and my penis enter her vagina for succesive 4 times then i pulled it out and i cummed out my sperms , and i afriad from being infected from her vaginal secrections that were found on the tips of the penis , then after all of that i have donate with my blood after 3 months from the last exposure and before donating they have made a full screening for different STD including HIV with ELISA and i have - ve result , but im still afraid , plz help