<s>[INST] Hi,My period is usually irregular however it always comes before the next one is due to come.  I have now missed two periods my first day of my last period was the 13th of november. I have not been under any more stress then usual.  I have been experiencing nausea.  The last time I had sex was New Years Eve (December 31st) .  Is it possible that I could be pregnant?  Should I take a test? or should I wait? [/INST] Hi,Yes there is a possibility that you could be pregnant.Do a early morning urine pregnancy test to see if its positive.If positive see an obstetrician and get an ultrasound as it can help date your pregnancy accurately.If negative and if you don't want to get pregnant you could take progesterone tablets for withdrawal bleeding and then consider Oral contraceptive pills, these will not only regularize your cycle but also provide contraception.Hope this helps.Regards. </s>