Possible tubal/ ectopic pregnancy

I just found out I was pregnant yesterday and I had an appointment with my OB already scheduled because I just had a baby three months ago and I've been having some really bad pain in my pelvic/ lower abdomen area. So when I was there he did the internal ultrasound to see how far along I was and there was nothing in my uterus.... So they did some blood work and I go back tomorrow for another ultrasound but the external one and he said he thinks it could be a tubal... I'm so scared and I read that it can be harder to get pregnant again depending on the damage. My husband and I were so excited to give our 3 month old a sibling already.