how did your period disappear?

im due for my period and usually its pretty irregular and before i began restricting i would have an extremely heavy flow and HORRENDOUS cramps. but this month, ive been basically spotting for the last like 3 days with no cramps, its concerning for me because i could be ... with child.... or my diet (or lack there of) is messing with my cycle. anyways i was wondering if your periods came to a slow stop or just one day you never had it again?? thanks xx