28 and TTC

So what are the pros and con's about becoming pregnant I have been trying for couple months now. My doctor gave me prenatal vitamins plus and folic acid. This my second week going on the 3rd next week taking them. My menstrual was due yesterday and still nothing in sight although and experiencing cramping and sore breast. The cramping slowed down today and I practically slept all day. Could it be that it has finally happened or am I over thinking it. Scared to take a test and become disappointed.