@twinkleday when you start leaking I'd start with the nipple cream, you can easily get cracked and sore, BUT ultimately, the best cure for poorly nipples is breast milk! I did use multi-mam compresses and cream when they were really bad and they were a life saver! I totally recommend them, even though they're expensive!
Did you mum/grandma get stretch marks? They can be genetic, so if they didn't get them you may well be lucky! I didn't get any with my first which is good, because I am useless with any kind of routine for skin care I'd recommend starting to regularly moisturise and drinking lots of water now because it'll all help in the long run. I think bump will start getting noticeable at 20weeks ISH, so definitely by then!