Hi there ~
It is not uncommon to have these symptoms while you are on birth control pills. You are also advised to take a urine pregnancy
test to rule out pregnancy. It may be worthwhile discussing the results with your boyfriend. If the pregnancy test is negative you may need to have a pelvic ultra sonogram. However you need to consult a qualified gynecologist to have things sorted out and relieve your anxiety
I hope this helped. Take care and have a nice day !