As far as I am aware Gemma, chemo and radiation can render a person infertile, so your best bet is that you both visit a fertility specialist. Your boyfriend needs to donate some viable semen (if not too late) for freezing and storing.
If the chemo and radiation render him sterile, you then have the option of using his semen for artificial insemination ~ which should be a fairly simple process since you would still be fertile.
If your boyfriend - Lord forbid - should lose his life, ask yourself if you would want to be a single mother of a child whose father has passed away and as long as you and your boyfriend have considered every possibility and thought things through, then the choice is yours together.
I pray for a good outcome for your boyfriend
With best regards
Jewel
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