tips on getting pregnant?

I know they say to try for a few months to a few years, but I hate waiting! I want to be pregnant so badly and that's probably my issue! What are some good tips on getting pregnant. My mom isn't well and I want her to be a grandma and I want to be a mom and my boyfriend wants to be a dad. I have been trying for about 3 months. I don't know if it's all in my head, but every morning I wake up with a headache and feeling nauseous. I also lost my appetite as well. My next period is supposed to be on 3/1. But I haven't been getting my usual period symptoms. Should I wait to take a test or should I do it asap?