Hello Sister,
Being that you're 30 years old, your fertility is probably beginning to decline. You're not too old to have children, of course, however nature does have it's way of taking its toll on us. Before going through all these medical procedures to have a baby, try some natural fertility boosters first. Here's a website with just a few, although some of them are pretty uncommon. http://www.babyhopes.com/articles/natural-fertility-boost...
Ask friends what works, it's a good chance they'll know or have heard of something. I've heard that eating salmon really increases your chances of getting pregnant. I don't remember which mineral/chemical in the fish helps exactly, but I do believe it works. I'm only 20, so i'm still fertile mertile i guess, haha..but my husband and I had eaten a lot of salmon before I got pregnant, and the first time we tried it happened. So if you like salmon, try it out. I know this method would be difficult because of having an irregular period, but if you can, try to concieve directly after your finished your period. Like the day after your last day of it. That works too, most of the time. The last piece of advice I could give you, when you try to concieve, make it as romantic and happy and enjoyable as you possibly can. I've heard that there's a better chance of concieving if both the woman and the man are in a great mood. Good Luck!