 [ Symptoms ] what if i get a severe reaction to milk because of my casein allergy [ Disease ] hi princess well anal sex and getting pregnant an outside chance but very outside only if after you dribbled sperm over you vagina two things its either your body was put off but you having anal sex if it was the first time there is nothing wrong with having anal sex lots of women love it as it still give them orgasms or your just having a missed period it does happens could be stress if you exercise could be from that lost any weight could be from that as well but if your still worried do a hpt home pregnancy test but why cant you see your doctor on your own what is said between you and himher stays that way being your now 18 hope this helps good luck