Confused

How long after missed period to test? I'm never ever late. I'm always right on time. I have had a few pregnancy symptoms. Itchy tummy, sore boobs, itchy boobs. Nauseated, smells make me sick. Around period day had some light cramping, not like i normally do, i normally have horrible cramps. Also i have eczema and its under control. About two weeks ago i woke up and was covered with it not normal. Never happend before, googled it could be a sign of pregnancy. Just looking for some guidance on what to do.