What are symptoms of ovarian cysts and ectopic pregnancy? I have nausea pain on left pelvic area and pressure and tightness. Have to unbotton jeans

Pregnancy test. Unilateral pelvic pain can be caused by a number of things. The first thing you should do is a pregnancy test. If it the test says you are not pregnant, then you can't have an ectopic. If you are, then it is important that you be evaluated immediately with an ultrasound, as ectopics can cause life threatening rupture. Ovarian cysts can be painful, but they are not usually serious.
Pain/bleeding. An ectopic pregnancy can cause pts to have a positive home pregnancy test, bleeding and pain. The pain can be diffuse, but it can (more often than not) have a particular side to it. If you have these symptoms and not a positive pregnancy test, it could be due to ovarian cysts to answer your question.
More severe pain. A tubal/ectopic pregnancy is a serious problem and should be seen asap. For severe pelvic pains, you should be seen emergently. If you do not think it severe see your regular doctor.