I'm pregnant again !! Irish twins

My husband and I just had a baby girl February 8 I had such a hard pregnancy with our baby girl we had decided we was going to wait a few years before having another baby we have 4 now in the house well about 4 days ago I had a feeling that I should take a pregnancy test and sure enough it was positive so I went yesterday and took a blood test and of course it was positive as well I'm so scared and nervous I had a c section with both my problems evious pregnancy and I still haven't healed from having my baby girl in February I don't know how or why it happen we was very safe I was breastfeeding which I had been told that makes it very difficult to get pregnant we had such a hard time getting pregnant with my daughter we tried for over a year and had to be seen by a fertility doctor and have his help to get pregnant with her but to get pregnant not even 7 weeks after having her being as safe as possible I'm scared to death and in shock I didn't think this could even happen dose anyone else have any advice or helpful information or even in the same situation please share because I have no idea what to do where to start how to tell my other kids that were pregnant again please only help and support I have a lot of emotions going on right now and with this news I also just lost my grandmother last Saturday so please be kind an helpful