<s>[INST] Hi. I have had my tubes tied for 2 years and ever since then my periods have been every 29-31 days. I recently decided that I wanted to get on depo because i have heard of  cases of pregnancy with your tubes tied. I had my depo shot on March 27 and was due for period anywhere between April 10-12. Around that time I had cramping like i was going to come on my period but it never came. Could that have been a side effect of depo? Also this morning i was really dizzy and I had to sit still, now I have a bad headache because of the dizziness. could that be a side effect of the depo also? [/INST] Hi, Your symptoms could be due to the effect of the demo shot since you did not time it with your cycle. Your period may get delayed or may not come at all as happens in some people. The headache and dizziness could be related to the effect of the hormone, and you should get your blood pressure and other vital data checked to see if you need any medical assistance. If you continue having persistent discomfort you should report to your consultant and switch to some other contraception. Take care. </s>