TTC

Hi everyone so me and my husband is TTC for almost 2 years now and every month I get my period normally some days a day earlier but it's always near the time that my period must come so 2 months ago my period was on time on the exact date but I only got my period for 5 days where it is usually 7 days long last month my period came a day earlier and it was 7 days long now a week after my period I started getting pinkish red spotting for a day and then it stopped a day goes by and the next day it's brownish spotting my body just feel so different the last few days and I tend to get heartburn and nausea alot and also headaches and back pain and then obviously with the spotting I also did a test a week ago and it came out negative maybe it was too early for the test to be accurate I don't know any advice ladies would be highly appreciated