Any reason other than pregnancy for large pink nipples?

Question

my female cat has never had large nipples, for her entire life (4 years). when we noticed large pink nipples, we assumed she was pregnant. however, she just went into heat, so i'm guessing pregnancy is out of the question. (don't worry, we're planning on getting her spayed asap) but is there any reason other than pregnancy that her nipples would suddenly appear like this?

Answer 1

Cats are receptive in their heat cycle for about 4 - 10 days. Technically, she could become pregnant during the early part of this cycle and still behave as in heat, but after this 10 day period, if she is pregnant, she is no longer in heat.