Need some reassurance

Delaini
Okay so Ik for some couples it takes awhile to get pregnant. But for some people it takes as little as a one night stand and an accidental cum and BOOM there's a baby. 
My boyfriend and I have been tryin for about 3 months now to get pregnant. We've literally been having sex everyday, sometimes twice a day. Except for when I'm on my period (gross). The first 2 months my period was at least a week late but this last month it was 2 days early. Idk what that means or really if it means anything. But we want a baby so bad. We just don't know what we're doing wrong or if there's anything we can do to boost our chances.
Any suggestions?