hi ! many have misconceptions regarding intercourse, that if they did not ejaculate inside they will not get pregnant, if you didnt not ejaculate inside that doesnt mean that your will partner will not get pregnant. only 1 sperm is required for pregnancy, not many, and many millions sperms will be released in one ejaculation, and only one reaches the ovum to fertilise. and sperms are not only present in semen but also minute quanity in precum also. many a times home pregnancy kits fail to confirm pregnany. which may be confirmed later through lab tests. so for the present we cannot say whether she is pregnant or just missed her period for some other reasons. and more over a confirmed diagnosis of preganancy can be given after 45th day. now it is better to wait and have a lab test done to confirm the diagnosis. in the mean while if she gets period you need not worry about it.