Should I Test Again?

So my fiancé and I have 14 month old twins. We are not trying to get pregnant but I had stopped my birth control when the twins were about 3 months old. I have not had my period this month and I’m 7 days late. My periods are pretty regular. I tested 2 days ago but it was negative. I’m 18dpo. We just use the pull out method 🤷🏾‍♀️. When I got pregnant with my twins I tested 2 days after my missed period and got very distinctive positive lol. I’m worried that I could be pregnant or is this just related to stress? I didn’t have any of the typical early pregnancy symptoms with the twins, so idk what to even look for 😂🤷🏾‍♀️. Should I test again or wait for AF to make an appearance?