My boyfriend and I had sex on the 9th and he came in me. My period was supposed to come on the 15th but it didn’t. My boyfriend and I had sex on the 16th where he also came in me. I took a test on the 17th just to see if he got me pregnant the first time and it was negative but I still haven’t gotten a period. Was it too early to check? How long before I should take another one?