Irregular periods can I be pregnant

Amber
Yes I know having unprotected sex is always a factor in becoming a brood mare i understand that!, what I am asking is I have had three periods in a Month for about 5 months lasting about 4-7 days. But now starting the month of September I have had regular periods lasting my normal 4-5 days. Can I be pregnant with all these whacky periods?.
​Also now all of sudden my left vagina lip
on the outside connecting to my upper inside thigh is this tender under the skin lump not like a pimple or anything but more or less a cyst?.
​It was very swollen now has gone done but still painful to touch..
​Thank you guys!