Pregnant again?!!😱🤭

I gave birth on Halloween 2018 and now my little guy is 4 months and I just found out I’m pregnant AGAIN!! Is it safe to have kids this close are there any risks? All my kids are 4.5 years apart, so this is a bit concerning. I’ve done research and I read that babies can be born prematurely. Does it happen all the time? Help ladies please! Any type of reassurance helps🙏🏼❤️