Anal to Vagina sex

So I wasn't aware of the possibility of having infections if doing anal to vagina sex. So my boyfriend and I did it today. We did it two times. The first time we went from vagina to anal and back to my vagina. The second time it went from vagina to anal and thats it. I did a little research and many people said that its not good because theres bacteria. I do not want infections or anything. I should've reaearch about it. This is our first time doing it like that. I'm so scared, don't want to deal with any infections, espically in my vagina 😣 ! Has anyone done this before and didnt catch any infections? Or what is your experiences if you did have an infections?