Regarding performing umrah

My question is I got visit visa from my sister husband who is settled in dammam . Now the problem is that we got the visa  but they stamp as well we can't perform umrah on visit visa. Which we eagerly wanted to perform . Now plz suggest us is it safe to perform umrah or not. Or what are the other ways as we don't want to do something illegal .  I forgot to mention the stamp is only on my husband passport as he is marram ..plz guide us

Sometimes they check on entrance at meqat...there is a check post there....but normally they don't....so suit yourself.