No. For a single HSA, you can contribute $3450 for 2018 and $3500 for 2019, plus $1000 catch-up provision if you are 55 or older.
If you have a family HDHP, you could contribute $6950 for 2018 and $7000 for 2019, plus $1000 catch-up if 55 or older.
You have until April 15, 2019 to make a retroactive contribution for 2018, if you missed it, you missed it. You don’t get that opportunity back.
