Is she pregnant? we dont know because she has a weird period?

ummmm me and my fiance have been trying to concieve for awhile now and we think that she has finally concieved but we dont know if she has bc she had 2 periods last month, one at the biggining of the month and one at the end of the month so we are jus waiting to see if her period is gonna start bc itz already the 21st of december and her last period was a little before the end of november and plus her NORMAL period starts the 12th of every month