My period for last month March was on the 13th-16th. It's expected to come this month but its already the 17th and I missed it. My boyfriend ejaculated in me on the 1st of April, ever since then I took 2 tests but both negative. So I missed my period in April by 6 days, took a test today and it still shows up negative. He ejaculated in me again yesterday. Is there a possibility that I'll get pregnant? Should I check again in weeks/days?