Boyfriend came inside me, hahaha help?

so my boyfridn and i have been having often, we always used condoms but since i've been on the pill for months so we stoped using them, he has came inside me three times and i don't really care but like, 2 minutes after i feel a little weird, a weird feeling kinda in my stomach, nothing painfull and its not pleasure but its just weird. feels like someone just came inside of me. hahahaha.. is there anything i need to worry about? has anyone felt the same?