For goodness sake, stop worrying about it. If yuu need the rest you need it, irrespective of previous pregnancies. I am not pregnant and have no know illnesses yet on Sunday I went to bed in the middle of the day and had a 2 hr nap while dh looked after ds.
I was quite frankly exhausted (for reasons to complex to explain, some of which were my fault) and was unable to put one foot in front of the other. Dh didn't resent this as I wouldn't (and haven't in the past) if he really needed to rest in the day.
We are ADULTS and we try and support each other. If you always assume someone is taking the p**ss then it leads to a vicious circle of resentment and point scoring.