 [ Symptoms ] acne and horizontal lines on back related what do i have plz help i am 23 years old female i had painful acne since i was 15 or16 mostly on my nose and chin  i have horizontal lines that look like stretch marks pretty sure they are not they started at the bottom once in while i will see a new line above the other ones i am not growing any taller so can not be stretch marks i did hormonal tests thyroid tests and everything is normal i am sure these two symptoms are related because my brother has the same things acne on nose and horizontal lines on his back [ Disease ] hi yes you can go through a pregnancy having periods but these are not regular periods there shorter like 3 days you could be having a phantom pregnancy you get all the symptoms and a bump but no baby do you know what part of your cycle you were at when you had unprotected sex it would have needed to have been 3 to 4 before day 14 of your cycle after that very chancy of getting pregnant but have you not been having sex since then if you want to answer just come back through answer this above