YES!!! PPD can happen any time in the first year or after. Perhaps you had some of the more subtle symptoms before this. Were you sleeping? Were you anxious? Were you eating normally? Were you having intrusive thoughts? Feeling tired or unmotivated?
I had some really bad anxiety and was not sleeping, but did not realize it was PPD until I found a great therapist who explained that to me. So, yes you could just now be having PPD, or perhaps there were some little things going on before now that you just did not recognize. Either way, try going to
www.postpartum.org for more info and for therapists in your area.
Best wishes.