Cheap preg tests

I took an early result test yesterday and got a BFP! Then last night I bought some cheapos (less then a $1) and the line was way lighter. I took another cheap one this morning and it was slightly darker. Today is the day I’m supposed to start my period. Anyone have this happen to them? Also, Saturday I tripped and fell and landed straight in my crotch on a curb. It was a trunk or treat thing with so many kids around. I’m worried it may have caused harm to the baby. I have no bleeding or anything. Thoughts?