Pregnancy with Peri-menapause

I am a thirty-eight year old woman who recently missed two periods and along with this came hot flashes, night sweats and a lot of anxiety and irritation with everything. I spoke to my husband about this and decided to visit the doctor, they drew blood and tested me and said my hormone levels put me in the peri-menpausal state. My husband and I had decided to have one more child before I reached forty, but now I don't know if I can. My question is, since I missed my period for two months now, will I be able to still get pregnant? I am obvioulsy not producing an egg to be fertilized or I would have my menstrual cycle, right? Since I am in pre-menapause, and my periods could be on and off, I will never know which month I will get my period or not, if I do at all again, so how do I plan for pregnancy?