In terms of pregnancy there are plenty of other signs which may give you some idea as to whether you are expecting. Apart from the obvious missing of a period, many women find they are urinating much more often than usual when during the early stages of pregnancy. This is sometimes combined with sensitive nipples, which often change to a darker colour than usual. Sickness and nausea can come along in the early stages of pregnancy too as well as tiredness and a different sense of taste, such as craving certain foods whilst going off others.
All of this is guess work though and it really is recommended to seek medical assistant from a doctor or even carry out a test using a home pregnancy kit from a pharmacy as many people show different symptoms during the early stages of pregnancy and in some cases women are unaware of any changes until very late into the process.