To bet or not on 7th street? New player question

I just started playing stud a few weeks ago. I play 2/4. I have been debating with myself about an issue that comes up very often in the games I play in, and I thought I would post about it and see what you more experienced players have to say. Lets say that we have the following situation, I bet every round and got called by the other player on each round. I have my man on a flush draw, and just for fun lets assume that all his hearts are live on 6th.

Me: 2[img]/images/graemlins/spade.gif[/img] Q[img]/images/graemlins/diamond.gif[/img] Q[img]/images/graemlins/club.gif[/img] 6[img]/images/graemlins/diamond.gif[/img] K[img]/images/graemlins/spade.gif[/img] 7[img]/images/graemlins/diamond.gif[/img] 7[img]/images/graemlins/club.gif[/img]

Him: xx8[img]/images/graemlins/heart.gif[/img] 3[img]/images/graemlins/heart.gif[/img] K[img]/images/graemlins/club.gif[/img] 4[img]/images/graemlins/diamond.gif[/img] X

I see a lot of players check the two pair here for fear that the opponent has made their flush. I usually bet my two pairs for two reasons. First, my opponent is an underdog to make his flush on 7th, so I see no reason to assume that he made the flush. Second, my opponent will probably call me with a smaller two pair and maybe even a pair of kings, and I'd hate to check down the best hand. Is this bet correct, or should I check and call?