Emotions

I'm 8 weeks pregnant iv only been with my new partner 3 months, splitting up before from a 7year relationship which I had 2 kids in that time. It sadly come to a end but now I'm pregnant and in a new relationship I just keep getting emotional thinking about my past relationship and worrying about the kids being effected. I'm starting to question what's best for me and my children having another baby in a new relationship isn't the answer for me being happy? Never cried so much never been so emotionaly drained my heads everywhere. Any advise girls would help thankyou