I just got a positive test this past week & I'm guessing I'm 4 weeks. My son is 3 and I found out at 5 weeks with him. When I had my blood tested I was very low on progesterone. So I took the hormone every night by mouth to avoid a possible MC. My doctor this go around knew we were trying and said when I got the positive to call her and then would get me the prescription right away. I won't have my levels tested till next week but just curious if this was common with women & if it can happen with each pregnancy?