The signs of pregnancy before a missed period will be Implantation Bleeding and Cramps, Elevated Basal Body Temperature, sore Tender and Heavy Breasts, Exhaustion and Fatigue, Nausea, Food Cravings, Aversions and Sensitivity to Smells, Bloating and a Feeling of Tightness and Urge To Urinate more than normal.
A pregnancy test can be done to see if you're pregnant but the pregnancy test will only be accurate from the first day of your missed period, although some pregnancy tests can be used as early as 4 or 5 days before your period is due you just have to check on the pregnancy test box or instructions to find out when exactly your certain pregnancy tester can be used.
Another sign of pregnancy is Milky white discharge although it doesn't always mean pregnancy but it is one of the pregnancy symptoms to look for.