Help me please

Okay so I got my period May 22nd and it lasted about 5 days. My bf and I have never had sex. He only fingers me, and I know what everyone says about possibly having precum on ur finger and pregnancy and all that. On the 5th day of my period I got the Depo shot. I looked online & it says ur protected if you get the shot on the first week of ur period. He fingered me the day after that but like I said “fingering w precum” is so close to impossible to make someone pregnant. I took a test yesterday bc I was feeling off and I didn’t see anything at first but then someone commented & said they saw something on the first one. I’m almost positive I took it before the 3mm & the second one was taken after the 3mm. Could it be an indent? I’m only 17 & terrified!