Google Sites is not offering a certificate for your domain yet.
openssl s_client -showcerts www.lafosterhomerenovations.com:443
40377A375B7F0000:error:0A000126:SSL routines:ssl3_read_n:unexpected eof while reading:../ssl/record/rec_layer_s3.c:308:
no peer certificate available
No client certificate CA names sent
SSL handshake has read 0 bytes and written 340 bytes
New, (NONE), Cipher is (NONE)
Secure Renegotiation IS NOT supported
No ALPN negotiated
Early data was not sent
Verify return code: 0 (ok)
You are certain this was successful? If it was, maybe wait a little longer. If it still does not work, try removing the domain and adding it again.
Did you add www.lafosterhomerenovations.com, lafosterhomerenovations.com or both to Google Sites?
To make HTTPS (secure connections) work, the server needs a certificate. Certificates can only be used for the domains named on the certificate. Google does this automatically after you connected your domain, but the process is apparently taking its time in this case.
I’d just wait and see if the problem is still there in a few hours.