Started using OPKs. Got two beautiful dark lines yesterday. We BD'd. But we didn't BD the week before because he wasn't in town. It was almost like the day he got home, I got a positive OPK! Lol. But we BD'd last night and plan on BD'ing the next 2 nights. Is there a chance I can still catch the evg even though we weren't able to the week before I got the positive OPK? I'm new to this! Help!