Thinking of abortion

My toddler is now going 3 years old. But current my marriage is having issue but we did not acknowledge it. Past 3 years I feel lonely and ignored by my husband. Only recently, we started to try just for the seek of having another baby. In law also giving us pressure to have another kid so my son won’t be lonely. We went through IVF to conceive my son. It was a very difficult journey that create unhappiness for us due to the stress we went through for infertility. We didn’t had much less than 1 sex a month some months we cannot be bothered to try. But last month we did once and I found out I got pregnant in April. Now is about 6 weeks and my husband don’t seem to be happy. He is traumatized about how unhappy after we had our son. With a lot of unhappy reasons as much as I want to keep this baby. I foresee we won’t be happy and might break the marriage and I think I should just abort the baby. I felt irresponsible as a parent as we are not loving parents. I know I will regret and guilty for the rest of my life but at least I don’t break my marriage and maintain a friendship with my husband for the seek of my son. Does anyone encounter the same problem and choose abortion?