Sex in 1st trimester

I literally just can’t with sex. I’m 7 wks 6days with my first baby I’m having terrible nausea all day. I haven’t had sex much since finding out about the pregnancy at 5weeks. I feel so bad that I’m not in the mood for sex bc i know my boyfriend is definitely in the mood but I’m literally just not in the interested. I also am experiencing terrible stomach cramping after orgasms. Is this normal?? Helpppp