TTC for 4 monrhs

My husband and i are TTC for 2nd baby. I breastfed 1st baby exclusively for 1 year (he’s 18 months now). Didnt get period for 1 year. Started period on october 2017 been TTC for 4 months. Im losing hope. Per the app my fertile period this month was from feb9-14. We had sex everyday except on the 12th. No symptoms except gassy some slight cramping on the 16. No other symptoms. Please help