Hello I had unprotected sex a month ago and I haven’t came on my period and I’m 3 weeks later I have recently been going dizzy and feeling like I’m going to be sick I have also been having very bad back pains and have been having headaches I took two pregnancy tests witch said take 4 days before your cycle is due I took the first one a week before and the lines was very faint recently I have took the 2nd pregnancy test but it came back with thinker and darker lines I have also been struggling to sleep and getting cramps Please can someone help me