trying to conceive

hello, so I'm here like most of us trying to conceive. I don't even know the last time I have been on birth control but I am also not, not trying to get pregnant. we agreed we wouldn't try purposely but we wouldn't also fight it if it was meant to be. so we are leaving it up to God. today I'm suppose to start my period according to this app, but Saturday I started spotting like never before. nothing to the point I even needed a liner. nothing to even amount. the color and everything is different. I only noticed when I wipe and it's not like anything I've ever experienced in the last ten years or so. it's confusing and making me anxious. I am not sure what to do. I tried a very cheap test and no luck. I tried again yesterday at night and nothing. I read to try first thing in the morning, I also read may be it's implantation and not my period it did only last two days. any advice? does it sound like implanation or could it be my period? Sorry it is so long.