Confused, frustrated )-:

I've been trying for almost a year now to get pregnant....I've only had my period about 4 or 5 times they are very irregular, and it's very frustrating....I am a plus size girl so I just had a couple questions...I've never used this site before, I'm new to this....question number one, does anybody know any way to make my period regular? Question two, with an irregular period like mine, is it still possible to get pregnant even though I don't get my period every month or as much as I should? Any input will help, I am so frustrated and depressed with all of this....)-: