Possible pregnancy?

My period is a week late. I have taken two pregnancy tests, both after my period was due, and they were both negative. My cycles are very regular, and this is the only month I’ve had this issue. I have lost a lot of weight in a short time, so I know that could contribute to any fluctuations in my cycle, but I’ve been having light cramps like I did early in my last pregnancy. I recently lost my insurance, so I can’t see an OBGYN at the moment. I’m just not sure if I should keep buying pregnancy tests at this point. Does anyone have any insight or advice?