I am a nervous wreck!!

So Adam and I came home tonight to find a Large notice on our mailbox......Be very cautious, there has been 3 break-in's and burglaries in our small neighborhood in the last 6 days. They have been watching the homes and when the husbands leave they enter the house while the Wife/mom and kids are home. One happened at 5:45 am, 2:00 pm, and 9:00pm. I don't know if they were break-in's or possibly knocked on the door and then forced entry. We have 1 measly little lock on our front door and told Adam that immediately need to put a chain lock on the top of our door!! I have my back door open most days and one of the burglaries was 2:00 f****** in the afternoon, BROOD DAYLIGHT!! No reports of anyone being hurt that I know of, but needless to say I am now a nervous wreck!! Adam leaves super early in the morning and gone all day, and then I come hope super early in the morning from work, so it scares me. The notice says be aware of people you don't know, we just moved in I wouldn't know a strange person even if I did see them. Just had to vent a little bit!!