Could i get pregnant?

So my husband is getting leaving soon for military work and we want more children ( currently have a 2 in the half year old & 3mo old) but i want to wait until he comes back in 2020. Last night we had sex and he didn’t pull out at all saying he wants me to get pregnant which is selfish because i will be without him for a year. I’m so upset but I’m 6 days away from my period starting could i still get pregnant?