Confused

I was just napping since being 12 weeks pregnant has gotten me super tired and then all of sudden I’m woken up to my boyfriend pulling my pants down and started having sex with me and he didn’t stop till he finished .. I didn’t tell him no but I didn’t want to have sex.. after it happened he left the room and I started crying .. should I be upset even though I didn’t tell him no ? No it’s my fault I should’ve told him no he didn’t know I didn’t want to .. it’s not his fault.