HIV infection is not related sperm or seminal fluid.its related to penetration.so u had penetration.but with whom u kept sexual contact it matter a lot.if he was having sex only with u then not to worry.but that person had multiple sexual partners then there is risk of having HIV.
Next Steps
HIV test now.again repeat it after 3 months.if it's negative then not to worry.u don't have HIV.even ask for your would be husband test for HIV.u don't know even he had sex earlier like u.
Health Tips
use contraception strictly