Question about stretch marks during pregnancy?

Ok when i was pregnant the first time i gained 70lbs ( yes 70lbs i was sooo swollen it was mostly water weight) and i did not get even 1 line of stratch marks. i am very thankful for not getting any. ( any mind u my mother has them everywhere, i heard they were hereditary) But my question now is i am alomost 2 months pregnant with baby # 2. Do u think i can get stretch marks with this 1 even though i didnt get it with my other 1? Thanks for ur time