I am going to labour in the early November, should I buy one tin of FM just in case I have not enough BM? What if I am having fever during BFing, can I BF my LO?

It depends on how earnest you are about breastfeeding. If you really really want to provide your child with breastmilk, I'd advise holding off on buying a tin. Firstly, one small tin is really expensive! Secondly, the possibility of giving up too early on breastfeeding is higher if you have a tin of formula milk around. Thirdly, other family members might give your baby the formula milk either out of convenience or because of their own beliefs, contrary to how strongly you feel about breastfeeding. I have seen mothers sharing about how this has happened to them even though they have told these other caregivers to feed breastmilk (expressed) if it is available. I myself bought a small tin when I had my firstborn and it cost more than $40, AND I didn't even use it, so it was a waste of money for me! That said, if you are ok with feeding formula and you eventually will give formula in future, then it's fine to keep a tin on hand, but the only thing is that it's sometimes tricky finding out what formula milk your baby will take to. I've heard that some babies have rejected formula milk (due to its taste), and mothers have to buy different brands and try different types until they find one their baby will like. If this is the case, you might like to get samples to try first. Check with your gynae (they sometimes have samples for expectant mothers) or paediatricians, or check online at the brand websites, etc. for giveaways.