Question about period...

Probably a dumb one, but...my husband and I are playing if it happens it happens. And normally my time of the month is the 22nd of each...which October was but then I had another on the 7thish of November...but was dark rather than a red...and lasted 2-4 days and done...now it's the 21st and been having some normal things that start for my regular 22nd period...we have had intercourse around the 14th and the 21st. Unprotected and half came inside once. Just wondering if I don't get my period the 22nd is there an issue or is it normal my period changed randomly and came nearly 2 weeks early. We aren't exactly trying... But we are at the same time. Just curious if I need to worry if my period doesn't come tomorrow or a day or 2 after. Thanks