I have several small pumpkins in my patch now (tennis ball/softball size) and I'm getting female flowers every day.. this started about a week ago so you're really not too far behind me. I don't really know what to suggest to speed it up but be careful about nitrogen rich fertilizers.. they'll promote leaf growth rather than bud/fruit growth.

My first year growing pumpkins too, so I'm no expert, but here's my 2 cents: 1 of my plants (Spookies variety) started producing fruit quickly, but the others lagged behind... lots of male flowers but no females... or female buds would form, then die and fall off without opening. But eventually these plants came through also, and now all of my 7 plants are producing at least one or two pumpkins. I think it has a lot to do with the overall health and vigor of the plant... I think the plant "knows" if it's strong enough to support fruit, and the females don't come until it's ready. So just keep your plants healthy, and they will come.
I also think it has to do with the amount of sun. We've had warm weather and tons of rain here in the Carolinas. My plants seemed for the most part healthy and strong, but most days were more cloudy than sunny. When the sun shined strong for a couple days, that's when my females stopped dying and started producing.