So back in March, during my ovulation, my boyfriend and I had sex - no birth control, no condom, and no "pulling out". I got my period two weeks afterwards, but it was very light, oldish blood and lasted only 4 days. I usually get my period for 7 days, and it bleeds normally, never this light. Just last week Thursday, I got my period again. Like the last one, however, it lasted only 4 days, and was almost entirely dried/old blood, and extremely light. I've been extremely tired/fatigued lately, and seem to always be hungry. Coincidence? Help, please!