I'm just wondering what the booster will do if I am pregnant I have don't home test and they have came back negative will it harm the baby of I am pregnant

No, it is thought to be safe during pregnancy. In some situations it is recommended in pregnancy.

Thanks for that my gp said if there was a chance of me being pregnant I couldn't have it and considering the hpt came back negative I told him no but now I'm thinking I did it too early but I'll just get the booster shot done anyway as I need it to do my nursing