Shorter cycle

My husband and I have been TTC baby # 1 for 2 months (I'm not complaining), usually my cycles last a full week, my flow is pretty heavy for the first 3-4 days then it is lighter the other 2-3 and mostly spotting the last day. Well I'm on my cycle now (started Thursday) and it's over already. I didn't know if other women have experienced shorter, lighter cycles when they were TTC.