At this point, and for a few hundred per month, I would just fund it yourself without expecting the company to repay anything. i don't think it makes too much difference whether you fund it from a personal credit card or transfer your own funds into the company's SVB account, and then pay things from there. George pretty much summed up why.
I'm in a similar situation, although I waited to open a business bank account until I did some fundraising. I'm keeping good records of my expenses (which are thousands per month), but more so I have a precise idea of total costs, as I evaluate against my own projections. That has allowed me to tell investors how much I've also invested, above and beyond sweat equity.