Too early??

me and my So had unprotected sex Valentine's Day..next day I got my mirena removed and Skyla inserted. while insertion it hurt a lot..more then when I got mirena in, she also took forever to insert it couldn't find my cervix, asking questions about a pointed uterus? ect. anyway I'm thinking it moved (due to it not being inserted correctly) and that I might be pregnant.
lately I've been feeling very tired
 (3/2 almost fell asleep at the wheel on my way to work at noon then got home 6:30-6:45pm and fell asleep until 730am) not like me at all. 
have been feeling nauseous lately..almost threw up at work today.  
boobs feeling full 
around 2/20? had some pink spotting with some small cramps (thinking Implantation?) 
anyway it's been 4 weeks today since insertion is it too early to test?