What do you guys think this means?

I went to the doctors the other day because I thought I had a yeast infection or a uti but when I got there the doctors did a ultrasound and told me I could be pregnant because they saw that my uterine line is very thick which happens when your pregnant they were saying I could just be really early but we are not sure because since I’ve had my baby 6m ago my period has been very wonky I also took a test and it was negative but I still haven’t had a period in about 6weeks☹️ anybody been through this? What was the out come?