Say what?!

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So I found out at 4w2d that I was pregnant, went for an ultrasound at 4w3d (my last pregnancy was high risk and I currently see a fertility specialist for pcos therefore the early U/S) well during the ultrasound we could only see the sac because I waa so early. Today my husband and I went back for another ultrasound at 6w4d only to find out as a COMPLETE surprise that... we're having twins!! I don't know how to feel since it's still an utter shock to me. The craizest part is when I got pregnant, I hadn't started fertility treatments yet AND neither my husband or I has twins in our families. Here we go... Twin babies due September 16th!