You can still get pregnant when nursing, I did. And I have heard of women who still get pregnant even without their periods resurfacing.
Ask your OB/GYN.
I let my kids self-wean. That is me.
Your son is 1 years old... so, he can have whole milk. Organic preferably. But, if your son 'rejects' whole milk (which some do), then you either still nurse him, or try and transition to whole milk using breast mixed with a little whole milk and gradually over time, increase the proportions until he takes it.
Or, some use Formula to transition off of breast.
THEN, you will have to see IF he takes to a bottle or sippy cup for his milk. Some will not.
In lieu of dairy milk (which is recommended because the milk "fats" are an essential nutrient for brain development), then some use goat's milk or almond milk... which are on par with whole milk. Soy milk has 'estrogen' in it... which negatively affects a child's development and hormones.
The thing is, no matter what, even if you 'wean' your son... he may or may not wean... then, what is he going to drink from??? A bottle? A sippy cup? A straw cup? Some babies will not drink from these things... or it takes time to transition them to it. So your son will be dealing with a lot of 'changes' ... ie: weaning from breast, transitioning to milk, transitioning to another type of drinking method, and the change in his 'usual' daily routine for nursing before naps or bedtime. SO.... there will be LOTS for him to deal with too. And it may or may not go smoothly.
REALLY decide, if getting pregnant now, before he weans is what you want. Or, you let him self-wean, and then try to get pregnant. Meanwhile, you will have to see what the status of your ovulation or periods is....
Try and consult with your OB/GYN... or a Lactation Consultant.
All the best,
Susan