Second month in a row I got my period late

January I got my period almost 7 days late then when I got it it was really dark and heavy lasted about 4 days this month I got it 2 days late and it's bright red , I don't understand what I'm doing wrong I keep doing what I'm suppose to and I still can't get pregnate , I can't afford the fertility shots and all that, what can i do ? I just want another baby 😔😟