It really depends on how much "sex related" interaction you are doing now.
I had to wait about 5 months before I could have intercourse with my current gf. She is/was VERY sexual, but she was a virgin and would not engage in intercourse until she got on the pill. She loves all types of oral, has toys and masturbated frequently. She was very paranoid of getting pregnant, and condoms were a scary option for her as she believed the risk of breakage to be high. Long story short, after a month and a half of being together, she found a doc, got the prescription and started taking the pill. She wanted to wait at least another 2 months until we had intercourse, so the pill was effective.
When we finally got down to business, it was great. We were sexual before, and intercourse was just one last thing we hadn't as yet done. We have been together over a year now, and sex happens on average 5 times a week. She appreciated my patience at the beginning, and it helped forge a stronger sexual relationship.
In fact, I feel waiting made it better, as I like a long, slow tease
If your gf won't even talk about it now, I feel it is because she feels some guilt for having to make you wait, or she is tired of worrying about if you are losing interest/thinking about it. Sometimes ignoring a problem makes you feel it has gone away.
Open and honest communication is all that is needed. If you are in a fairly sexual realtionship now, the intercourse part will be the sweet icing on the cake. If you are not very sexual now, perhaps some interaction now will be needed as you could be in for a surprise after the wedding day otherwise.
Good Luck!