Faint line 10 weeks after giving birth while exclusively breastfeeding!

I have been feeling a little off and I definitely had a faint line today😳 I’m so scared what my OBGYN will say! I have mixed emotions. Has this happened to anyone else? While breastfeeding? I’m feeling a little sad for my 10 week old😬 I’m going to test again in a few days. Haven’t had a period!