I am very worried as to why I missed my period. Around the time I was supposed to cycle I fooled around with a guy but there was no fornication. I feel really stupid asking but is it possible to still get pregnant even if you didn't have sex? I konw if you were sick for a while you could miss it and iw as for a long while specially when I was supposed to cycle then I was put on anitbiotics for about a week. Would that delay it? I know all the signs of pregnancy and I am always tied but I dont get sleep when I am supposed to. Plus my lower back started to hurt yesterday but I figured that was from walking around for too long. And my left breast is super tender. I am very nervous as to what is going on with me. I have no eating disorders and I am not super active so I want to know what this might be. Any help?