I have loss for stock 2018, but I didn't have Schedule D and don't know if the H&R Block filed it for me last year. Can I still add it to Capital Loss Carryover? Thanks!

Line 13 on my 1040 is empty. But I do have D form for California, where line 10 gain/loss from federal Schedule 1 line 13 is empty. I really doubt they filed federal Schedule D for me. May I still able to add the loss amount to Capital Loss Carryover if they didn't file it for me last year? Thanks!