Just need advice

I don’t know what I’m looking for. I’m just really scared right now. I’m one day late on my period and I’m never ever late. I just know I’m pregnant and I don’t just don’t want this. I know we were careless. I have someone who is very very supportive and he does want this. I just feel scared. I know this is from God and is will. I’m just not ready for this again. My daughter is 18 years old and my son is 18 months old. I just need positive good words.