Do you think this is pregnancy or something else?

Hey guys and gals. I had in March, April my period was so faint and brownish i'm not even sure it was there. On top of that it was way late. It almost always comes on the 21st but it came on the 27th. I didn't think anything of it becacuse i've gained a significant amount of way over the last year. Imagine my surprise when it didn't come at all in May. I may have made matters worse by having last night and yesterday. I'm 30 years old and i've thought about menopause. My stress level is same as always so it's not that. I just can't be pregnant, can i?