Should I send him another email? Or should I wait for him to reply?

I am in a long distance relationship with my bf of 2 months. We normally keep in touch with each other through emails. He is on a business trip at the moment and hasn't emailed me for a week as he is busy. I emailed him twice, but he hasnt replied. The last time he was on a business trip he didnt email me regularly as well. Should I send him yet another email to show I havent dissappeared or should I just wait for him to contact me, no matter how long it takes. I know he needs space while at work but at the same time I dont want him to think I have forgotten about him.