Business Visa - B1

I was in USA from 2006-2011, in J1 and then in H4. Now I have changed my field from research and have started a business in my hometown. For that I wanted to attend a trade show in USA and applied for B1 visa. The interview was as follows:

VO : Good morning. Show me your passport.

Me: Good Morning. Gave him the passport343

VO: Why you want to go to USA?

Me: Answered

VO: What is your highest qualification?

Me: Answered

VO: What kind of business you have?

Me: Answered

VO: How many people are employed in your business?

Me: Answered

VO: What does your husband do? And how old is your kid?

Me: Answered

VO. Are you going for a trade show?

Me: Yes

VO: Are you going to sell your products there?

Me: Yes

Then VO took my fingerprint, and asked me to wait. After waiting for 45 minutes, he called me and handed me back the passport and 214(b) form and explained me that he cannot grant me visa, as I cannot go to USA at this point to sell my products and make money in USA.

Can I reapply for B1 visa within a week? Or shall I apply for a B2 as I really want to attend the trade show. Or will it be wise not to apply again now?