Should I test?!

So we’ve been trying for about five months to conceive, I am currently about 3 weeks late on my period, as in I get my period the first week of the month and we are almost at the end of January and no AF. Should I take a test now or wait until I’ve missed another period? I stopped taking birth control at the end of August so I wasn’t sure if it could be just hormones out of whack or what! So hoping this is pregnancy but don’t want to be disappointed if the test is a big fat negative!