I am 22 years old, and I have always had irregular period due to being slightly under weight. My usual cycle range from 60-90 days. I have been trying with my husband for the last two weeks, and we tried once right after my last period ( my period started on the 19th Oct ) and twice early last week ( 28th Oct - 3rd Nov ). Today ( 6th Nov ) I have been getting cramps and tiny brown mucus discharge but I did a test and it came out negative. I have been wanting to pee all the time. Could I be pregnant or it's not possible?

Thanks for your help!

You could be pregnant, but it would be impossible to tell. It is a waiting game at this point. Slight brown discharge is not abnormal. I won't say that you are, but you're going to have to wait for a bit to find out. Might not be until mid to late November. Maybe even into December.