NOBODY here knows whether a termination would be bad for your MH and they shouldn't be throwing it about so casually.
Equally, NOBODY knows that you'll be fine and happy with another child.
Right now, with everything going on, it might not be the best thing, but that's for you to decide.
Not your DP. You. It's your body, and your health.
What I will say is an early termination is not "getting rid of a baby" or any other emotive nonsense people might come out with.
It's simply untrue that "you never regret the children you have", in case that comes next.
But neither will your world collapse if you go ahead with it.
It's new. Take a moment. Take another test. Make a decision that works FOR YOU. Think of yourself, your baby that you have, your relationship, your health mental and otherwise, and make a choice based on what's best for all of that ^ and not for a baby that literally doesn't exist yet.