Have 28/29 day cycle. Ovulated on cd 18. Had sex that day. Today is cd 30 Still no period. Negative test. Cramps since cd 25. Can I be pregnant?

Pregnancy tests. Home pregnancy tests are very accurate. They are the same tests used in a doctors office. They can detect a pregnancy 7-10 days after conception. The best time to take one is when you miss your period. If you doubt the result you can repeat it in 1-2 days. If you were pregnant the hormone level would rise enough for detection.