Well when I was 17 I got pregnant. At first it was a shock but then me and the baby's father were happy, we had already been together for 3yrs at that time. But once he told his family they pressured him to leave me and so he did. We were living together at the time and they even had me locked out of my own apartment. They tried to convince me to have an abortion (I was 4.5 months), so I actually thought about it but then my doc told me that because I was so far along they would have to put saline solution into my uterus which would kill the baby then I would have to deliver it. So of course there was no way that I could do that. So I went on to have my beautiful baby boy.
When I was 7.5 months the father wanted to get back together so I took him back...that lasted until my son was 1yr old. It was hard being a single mom but I do not regret my decision. My son is now 11, I am married to a wonderful man and we have a 5 yr old daughter together.
Each time I have been pregnant my family doc always referred me to an OBGYN. Depending on your doc they may order some blood tests and an ultrasound. Your symptoms sound very typical for pregnancy. I was soooooo tired for all my pregnancies and my breasts were extremely sore. I didn't have too much morning sickness, just certain smells would disgust me.
Don't be scared to tell the dad. All you say is ''Listen this is the situation, I am pregnant, and I am keeping it whether you want me to or not. If you want to be a part of the baby's life then that's great, if not then that's your choice as well. I am willing to do this on my own, but be prepared to be responsible financially''
Don't be afraid either to go for child support, every father whether involved in the child's life or not has to pay support. Plus it really does help, especially when you are a single mom.
Are you taking folic acid now, I am sure that you are fine but it wouldn't hurt to start taking them anyways.