What happens if a stock gets delisted on TD Ameritrade?

No, you will not lose money if your stock gets delisted. Yes, you can continue trading the company's shares.

When a stock is delisted, shares are traded over-the-counter (OTC) or the pink sheets. This means that the stock is outside the conventional financial system.

That said, it is not a good sign if the security is delisted because it might signal insufficient market capitalization or imminent bankruptcy. It might be a wise idea to sell before you bleed any additional losses.