You're fine, lol
This is very, very normal behaviour for your fish. It is kind of spawning behaviour. Really nothing to worry about.
Ours do the same. This is a sign that they feel well and are happy 

iv never worried so much about fish in my live they are so pretty to watch i just love them they sim to be very loving with each other was brought togther and out the same tank at the shop 

You've got all the reason in the world to like those fish of yours, they're beautiful!

This is so lovely to read... yes goldies are so cute and they are real characters and every single one has got a different personality.

Test your water ASAP for Ammonia, Nitrite, Nitrate, pH.
Could be Ammonia burn

I agree with Andrea! It's a rather big possibility that it's ammonia burn, since your tank is pretty new, and cycling it takes a while
So if you find any ammonia, you should check the nitrites as well! If any of these are present, it would be good if you'd buy some bio-filter booster of some kind I had the best everrr!! It cycled my tank in two weeks xD And it helps the fish recover from small wounds as well So try finding "fluid filter medium" by Easy Life It should help the ammonia burns heal, and help your fish fight off possible disease during this stressful time

i have a fluid called AquaSafe for goldfish makes the tap water safe im in the uk if that helps 

cool il have a look now online ty hanna 

im learning this lol

im getting the testers today I HOPE also my Fantails sim to be fine DIDNT help Dorie decide she would get stuck behind the water filter pipe yesterday shes eating fine tho ETC 

Black spot has gone now yes water changimh every few days i let the tank settle a bit before i changed it this time the Aqua treatment sims to work well

When Torin gets fussy, he sits in his swing and we watch the fish, and it calms us both (well, usually ).  They just swim so beautifully.
By the way, is it okay to go two weeks between partial water changes?  I test the ammonia every week, and it's fine, and the fish seem healthy.  We used to do it each week, but now that I have a little one and my husband is working 12 hour days, we're just too tired to do it as often as before.  If, however, we need to, we can suck it up, but I'd feel better knowing there was some leeway.