Well, you are starting and stopping birth control so your hormones are adjusting to this. Being late, irregular, etc. is normal. Also things like stress, changes in routine, weight gain or loss, illness, etc. can cause us to be late. I'm guessing you are just late and the other symptoms are hormonally related but not pregnancy related. Pregnancy tests are pretty accurate. You can take another one now but if it too is negative, you aren't pregnant. good luck