My cat died suddenly and tragically yesterday, he was a rescue. Is it wrong to feel like rescuing another...?

Yesterday my cat suddenly died (at the vet while they were trying to save him) form a blocked urinary track. Apparently his was a case where the blockage set in quickly and he was liekly ill and died in no more then 36 hours. In a sense I feel guilt; sipmly because he was like a baby to me. However after reading more about the condition I feel a bit more at ease that given the short time frame, and his overall personality; there isn't much I could have done. We rescued him almost 3 years ago from our local shelter. I was pregnant with our first child and home all the time just waiting for her to be born basically; and wanting something to take care of and love in the mean time. He was really my first baby, I literally carried him EVERYWHERE. If I went to get a drink of water I felt guilty leaving him alone on the couch, so I'd take him with me. She was a semi-difficult pregnancy and he really is what helped me get through it. He occupied me at times where had I not had him, I likely would have gone crazy. Our daughter, now 2.5; was very attached to him as well. He was a great cat. My husband is NOT a cat peron but even he was heartbroken over the loss. I AM however a cat person. I don't think there has ever been a day my whole life that I have NOT had a cat. I certainly could never replace him, nor do I want to. However I almost feel the best way to honor him and to keep myself from being an emotional wreck is to get another (rescue again). However I really do NOT think my husband will go for it. Firstly because I am pregnant with our second baby and I can't do litter duty. And secondly just because it took soo much for him to consent to having our first cat; that I really doubt he'd ever get another. We also have a chocolate lab who is 2 and I can tell she is a bit depressed today; she knows her playmate is gone. Thinking about getting another cat (not literally today) but in the next 2-3 weeks in one sense seems rediculously hard; but at the same time eases my mind. Any suggestions?