Light spotting

Marne • I am 31 years old and we have been TTC for 7 months. So far I`ve had late periods, spotty ones. Still no PPT
Is light spotting three to six days after main ovulation day a sign of early pregnancy? My period is due in about five days but 3-6 days after I had sex on the main ovulation day I started to very lightly spot. Any ideas???