According to my <a href="https://play.google.com/store/apps/details?id=com.glow.android.eve">period tracker</a> my ovulation was on the 17th of Feb. It is now the 23rd and today I experienced a headache and slight nausea for 1.5 hours and when I went to the toilet I saw this in my panties (gross I know, soz..) could this be implantation or something unrelated? Note: I want to be pregnant and had sex from the 15-17th of Feb. last period began on the 4th of Feb. I stopped my contraceptive (Nuva ring) on 30 March.