My wife's period date should be on 01.03.2014 but she don't have it till 16.03.2014. During this time on 10.03.2014 we have done the home pregnancy test by using the pregnancy kit and it shows positive by two red lines. We keep it secretly and don't disclose to anyone. After that we stopped sexual interception. But on 17.03.2014 we had a sexual interception and just after we found some red liquid like blood coming from her vagina at one time only. After that today it is found the same liqud only one or two drops. Please advise us. Is this is her normal period or she is pregnant?