What shall I do!!!

I am nearly 3weeks late on my period haven't really had many symptoms but in about a weeks time I have to go for an X-ray I am gonna do a pregnancy test in the morning but even when my gut tells me there is a chance I am pregnant the test say negative thinking about going to drs for a blood test but really don't know what to do have heard X-ray's are not good and don't wanna harm a potential baby but don't wanna make a fuss if I am not pregnant šŸ˜–šŸ˜„ please any help would be appreciated thanks in advance