Everyone is different. Some people find themselves having multiple lucid dreams per week, after just working on the methods for a few days. Others work for weeks or even months before getting any results. Also, these things seem to go in cycles for a lot of people. You may have several LDs in a week, and then none for a couple weeks.

IMO you're making pretty good progress. Don't let yourself get frustrated -- if you keep at it, I'm sure you'll find ways to tweak your routine that makes lucid dreaming more likely to happen for you.