question and explanation

I'm 19 yrs old bTw. 1. What is the best birth control pills you can recommend? ---because my husband did'nt want to use condom? i'm afraid to get pregnant again. And FYI im not yet get my first period after i gave birth.. my son is 1 yr and 1 month already. 2. What is cycle length mean? --- coz i downloaded a period tracker and i don'5 know how to use it? so sorry for that ..