Being a single Parent

I have again run itno issues with being the one and only at home right now. I was supose to go this morning and have an ultrasound done and I don't have a babysitter for Ryan. I never even thought about getting one until this morning. But it's just my luck that they do not allow kids and I would need someone to watch him. Why does this always happen when DH is away. I once had to have a pap smear done after Ryan was born and the doctor YELLED at me for bringing him and Layna. She almost refused to do it. I was in a place where I didn't know anybody and my husband was deployed so I had noone to watch them. Which is usualy the case. I just wish DH was home to help me.