Triangular UFO sighting across Riverside sky...

My husband and I were outside about to have a smoke when we heard a loud helicopter hovering above us really low.  Shortly after, my husband tells me to look up at the sky and we see two triangular objects flying across the sky at a slow speed and low.  The triangular craft was made up of circles of that makes sense.  They disappeared into clouds then we saw two black dots float across in the same direction as the triangular ufos.