It is important to stay calm if you notice small spots of red blood during your 15th week of pregnancy. While it can be alarming, it doesn't always indicate a serious problem. This type of bleeding is known as spotting and can occur for various reasons, such as implantation bleeding, cervical changes, or even sexual intercourse. However, it's always best to consult with your healthcare provider to rule out any potential complications. They may recommend monitoring the bleeding and possibly performing an ultrasound to ensure everything is progressing well with your pregnancy. Remember, every pregnancy is unique, so seeking professional advice will provide you with the most accurate information and peace of mind.