Spotting after period

Payton • I am 22 my husband is 23. We just got married February 13 of last 2015! We have been trying for a year...🙏 Baby #1🙏
As soon as I ended my period which is only 3 days long ever I started spotting Saturday will mark 4 days of spotting anybody have any clue what could be going on? Periods are always regular never with any spotting...pretty worried 😞 negative test...ugh 😞⬇️ this is my underwear from yesterday and today I think the spotting is done then boom spotting again so I have a panty liner on now