Hi, congrats! I have been breastfeeding at the start of all my pregnancies (after no1!) and never had an issue. With baby 2 I fed until around 8 weeks, baby 3 I was about 11 weeks when I stopped feeding, and this current pregnancy my toddler stopped feeding around 14 weeks. You should be absolutely fine
I’ve also had approx 2.5yr age gaps as well, and it’s great! Never had any problems with that Age gap at all. I would say, if possible, get no1 out of nappies a good while before no2 arrives. Trying to potty train with a newborn isn’t something I’ve ever wanted to get in to!