Should I test?! Freaking out!

I’m on birth control pills (combination), pretty good at taking them but sometimes I have been a couple hours late. EVERY TIME me and my S/O have sex we use a condom on top of me being on the pill. We had sex on the 15th of March and last Thursday. Last Thursday we were really careful because I’m on antibiotics so I know it an decrease the effectiveness so we took extra precautions!

I’m on my placebo week right now (Started on Sunday, on my 4th day) and I should have my period but this is what I’m getting instead! It’s very very light bleeding more of it is dark brown but it’s not even enough to fill half of a tampon. I have had a panty liner for the past two days (changed it ofc) and throughout the whole day I get like two drops. Usually, I can fill at least one full tampon a day and it’s bright red blood. What is going on?! My boobs don’t hurt but I swear they look bigger like my aerolas, but I’m also very flat chested so maybe it’s in my head. I was nauseous yesterday either because of this or because I have a lot of anxiety about this situation. I have been having cramps, gas, bloating and some other symptoms. Should I take a test? I’m really freaking out :(