Light spotting no period

Kayla

Hi ladies, I am back on the pill after having a baby. I've been taking it for about a year now having previously taken it for 9 years (I went off it to get pregnant). I have never had a problem with it before but this cycle I only got spotting instead of a real period. I have tested twice and both came back negative. How many times should I test before going to the doctor? Thanks in advance.