I'm pregnant! When to tell parents....

I just found out we are pregnant today!!! We are overjoyed as it is our first. Our family is in town (my parents and husbands parents) from out of state for easter and we will not all be back together again for a long time (at least 3-4 months). Should I tell them now? Understanding there are risks to this early... Or wait and do it over the phone. We are all very close, so I'm leaning towards telling them!