Anxiety...

I’ve been on the pill for 3 years. I never let my boyfriend finish in me. Lately my periods have been super light and short and my anxiety has been killing me over being pregnant. Ive taken a ton of pregnancy tests and all have been negative (except a Walmart 88 cents one appeared to look positive/ evap line after the 10-15 min mark) I took a first response digital and regular today and they were both clearly negative.. I’m 19 dpo.. my period came on the expected day but I only bled for a few days and it was extremely light. Any advice ??? I also have kidney stones right now. I’m just in complete panic mode I’m 20 and don’t wanna be pregnant.