Is it messed up or selfish to get pregnant when your 1st child is only 8 months old ?

I’m coming up on a period & I missed a few pills and have been having unprotected sex with my husband. I’m starting to get scared and nervous and feeling like if I was pregnant I would feel guilty because she’s still so little...I know she would be about a year and. A half by the time I had another baby but still that seems like it would be so hard ...what do you think