Feeling so upset over making a choice

Took a test earlier and come as a complete shock to find I am pregnant. I haven’t been able to stop crying for a few hours now as I am so torn on what’s the best thing to do. I currently am a single mother to a 16month old. I’ve been causally seeing someone and we was being careful , I guess that’s why I was completely shocked to find out I am pregnant. My mind is all messed up right now , knowing that I will have make a choice. I’ve always been a sensitive person and the thought of choosing to terminate is weighing heavy on me. On the other hand the situation I’m in I don’t think bringing a child into is realistic and I don’t have the financial backing either. Any advice would be welcome! Any input on how you was able to make such an impossible choice or even how much of an emotional impact it takes making the tough choice of termination