If you pray it before dhuhr then you must pray the whole salaat which is 2 sunnah and 2 fardh, but if you pray it after dhuhr then you can only offer the fardh salaah.
salam
Try to pray as soon as you are able to pray. Also the prophet pbuh said that if people knew how important the isha and fajir prayers are the would run to them. Try to make it a habit waking up to pray fajir may allah help you and the umma in whole.
If you missed a prayer, try to pray as soon as you can inshallah. Delayed or missed prayers are looked down upon in Islam. Nevertheless for whatever reason ask for forgiveness just in case and always, inshallah.