Had unprotected sex dec 26th missed my period all jan started spotting feb 2nd on and off i don't understand could i be pregnant when can i find out?

Check a test : Anytime you think you might be pregnant the easiest thing to do is to check a pregnancy test. I would not think so since your last period was less than a month ago. Usually we do not suspect pregnancy until someone misses their period.

Pregnancy possible: You could be pregnant. Take an over the counter pregnancy test asap. If positive, see your ob/gyn. If negative, and there have been no recent episodes of unprotected sex, its very unlikely your pregnant. If irregular cycles continue for 3 months contact your ob/gyn.