Conceiving tips?

Jessica • Jess - 19. Boyfriend - Zach 22. Together since 031011
Hey all! My name is Jessica, I am 19 years old. My boyfriend (Zach, 22) and i, have been together for almost 4 years. We have decided to start trying for a little bundle of joy. Neither his family, or mine know about this. Oops! But it's best for just us to know! I have recently , well for the past few weeks, have had pregnacy symptoms. ( tender breast, spotting, feeling sick, etc) but getting nothing but negatives.  Any tips on conceiving ? Thanks in advance!