Spotting from 10 days no pregnancy. Me.

Hii i am anemic i have thyriod also with overnight My last month period was on 12th of march with normal bleeding..this month i spotted on 14th of april after that no bleeding on 15th and 16th..again i spotted on 17th evening but no bleeding on 18th, than again i spotted on 19th,but no bleeding on 20th,  again on 21st very light bleeding started..i did beta hcg test done on 21st april result is negative with <o.6 value,again on 22nd of april very light bleeding same on 23rd April... than again spotted on 24th april..than no spotting on 25th..than again spotted on 26th and 27th...no spotting on 28th... i thought its clear now.. but again today i spotted.my question is why it's happening why spotting not stopped yet today is 10th day of this episode i have no pain no cramps..is there anything serious in this please please reply me..i have iron infusion day after tomorrow can i go for this in this condition please let me know.