Help!! Im pregnant!!?

Last night took pg test its positive. Here is my story. Husband of 18yrs is in remiision of testicular cancer. Docs said very slim chance of concieving, I was on depo for quite awile and then my health took a tumble and docs took me off of depo until my body was somewhat back to normal. I am 36 husband is 42 and we have a wonderful daughter 12. We really accepted she would b our 1 and only. I am still in shock and have not told my family I know after the inital shock my husband will b happy or i hope anyway! I am just scared to death of my age and starting all over again, How will my daughter take the news?? Is it safe at my age? I have very high blood pressure and this worrys me too.Not like i would consider the opposite! please just give me some advise, Im really worried