5 positive tests at 4 weeks?

My period ended on September 6th, it is now October 1. I tested last night and got 2 with faint lines, in the middle of the night it was more predominant, and this morning I got 2 solid lines. Twins run in both of our family, and over the weekend we had some eerie forshadowing happen that suggested 2. This morning we had amazing sex and when he pulled out his baby gravy drew out a 2 on my stomach. I was wondering if anyone else has had this happen. And could it be possible that the lines are darker so early on because of twins?