2nd baby guilt

I have an 8 month old baby and my husband and I decided we wanted to go ahead and start trying for the next baby as it took a couple years as well as two losses to conceive our son. Well I actually got pregnant immediately which my husband is super excited about. I however have mixed feelings that I can't seem to get a grip on because I feel guilty like I'm going to be cheating my son of experiences and attention. I will say I had step siblings growing up and still as an adult have to deal with the effects of favoritism among my step siblings. So I'm not sure if that is the cause of the way I feel or if it's just hormones. If anyone has experience with this or advice I would love to hear about it! Also my son will be about a year and 3 months old when new baby arrives.