Not sure if I should test

Ellie

So according to this app I’m 11 days late. I recently had an std and sometimes that can cause period being late. October’s period was late but technically I haven’t gotten November. I’ve been feeling tired and nauseous all week but no pms. Then this morning I threw up and have felt sick all day. I’m not sure if I should test or not, since I seem to have pregnancy scares every other month?