Really Need Answers!!?

Ok so i have been breastfeeding for one for almost 2 years now...my period just started back last year of November on the 18th and Again It Came On December on the 18th,....Lucky Me No Period Of January 18th So Im Thinking Okay I Might Be Pregnant Waiting And Waiting And Waiting And Takin Test After Test After Test,.....Nothing!!!!! BFN!!! Whats Up??? Here it is Jan 31st an im seein maybe some spotting not enough to be a period im assuming since this started yesterday it cant be a period its not heavy enough for one its light very light

Yes i have been having symptoms and all this whole month,....nausea headaches backache,....mild cramps everything but a positive test....its been a week since i tested n im afraid if i do another its gone say Negative!! So Whats Opinion on This??