Help! When should we DTD?

We are TTC a boy. According to my cycle (I'm super regular with a 28 day cycle) I will O on Tues, the 11th. However, my hubs is going out of town from June 9-11 and 13-16 (leaving morning of each time) so we will miss the 2 days before. I'm not doing OPKs right now but will probably buy some today.
Anyone have any advice? Oh, and I'm starting the HE diet today and only take Folic Acid supps. Thanks!!

If you only just started the HE diet today I would skip TTC this month(thats just what I would do). They suggest being on the diet for at least 6 weeks before hand.

Sorry I didn't see this sooner!!! I agree that I would hold off a month but if that was not possible, I got boys from attempts many days before ovulation...timing does not sway!!