I remember my first dollar in MRR so well. It's an incredible validation that you have something that can work. Going from $0.00 to $1.00 in revenue is difficult and impressive, so take a minute to appreciate that.
That said, as I'm sure you know, you're a long way off from a sustainable business.
To answer your question, it's not too early to look for investment, there are plenty of businesses that get funded without revenue, but it may really not be the right decision for you. Do you have a lot of competitors that are breathing down your neck or a large entrenched market that you need capital to get into? If so, then you may need the funding.
Sales automation is very competitive market, so in this space I would generally lean towards yes, you need it.
But on the other hand, it sounds like you're making some money without that. IMHO, with what little I know about your company, I would try to hustle your way to $7k/mo in the next 6-12 months. During that time, figure out what you and your partner/contractor/buddy are good and bad at and where the bottlenecks are (e.g, coding, marketing, sales, customer support, etc). Get a good idea of your growth through different marketing channels, your churn, and generally how much your customers like your product. While investment makes your feel good and can get you some press, it's a necessary evil, not necessarily something to be proud of.
Keep going on your own for a while.