I just found out I'm pregnant a week ago but not sure how far along I am. I had unprotected sex on a thursday and took the day after pill sunday which I know is only about 60% effective the third day. I had my period in may but only lasted about 4 days and was light. I'm wondering if I had got pregnant then or afterward? I started getting pregnancy signs the beginning of June. My question is how common is it to still get your period when you're pregnant? And how accurate are ultrasounds when determining how many weeks you are in early pregnancy? Thank you!!