I had unprotected anal sex( inserting penis in bums) ,no semen released on oct 23rd and my period is oct 9th.didnt get my period.might be pregnant?

It's possible: Certainly possible if the penis landed in the vaginal area instead of the anus that something could've come out even though you say there wasn't a full out ejaculation. You will need a pregnancy test if you missed a period. For future reference anal sex is risky for both parties in terms of many complications. I'd recommend you reconsider that practice. More questions? www.healthtap.com/drsaghafi