It won't make difference in time, it will stay as it is now and that might be a bit heavier than with embroidery bobbin thread, but if it feels OK I won't worry.
It won't make any difference but you will notice that you will run out of bobbin thread a lot quicker.
I don't think it will cause trouble in time, because you can also embroider using the same thread for embroidering as for the bobbin, for example with redwork embroidery if you don't want to have a front and backside. So if it does look okay now, I think it will stay okay. *4u
Or will it be fine. I am very concerned as the project is for a gift.