Im scared

I got my positive pregnancy test on the 31st of January, last night my body was very stressed and emotional and angry i got so worked up at one point that i could feel my uterus pulsing strong! This morning ive woken up to this blood... over and over when i wipe with mild cramps ... in the blood its alot of uterine lining, im scared im losing thia baby already... help is it normal for this like 4 days after positive test@ my test was negative on the 27th and went positiveon the 31st ... it was stronger or darker than control line though, yesterday it got darker but im not checking today. Im scared. Help