7 days

I'm now 7 days LATE for my period I tested yesterday morning and the night before that and it was negative I went to throw the tests away and I seen faint faint lines which I know can be evap lines but I've never seen a evap line on any test I've taken before so this is different for me but I know it's still possible I'm just super confused as to why I'm late I had a miscarriage last year in March and I've had regular periods since then the past 2 months my periods have been 4 or 5 days earlier than what my period tracker said but had normal 7 day periods and have had normal 7 day periods since the miscarriage and now I have NO symptoms of starting at all other than some bloat and sore boobs but my boobs don't get sore before a period so I normally don't know I'm going to start until I cramp and then within minutes I start but I've only had really mild cramps the other night and thought I was going to start and still nothing. anyone have any idea what could be going on has this happened to anyone and you end up starting or not starting and being pregnant?? cause I'm at a complete loss and I'm starting to get worried something is wrong with me or something because I just don't see why I would have regular periods and now all of a sudden nothing unless I'm pregnant and it isn't showing up yet??? HELP!!!