Your ovulation scan plus a missed period since then put you at about five to six weeks along, counting from ovulation. A transvaginal scan usually starts showing a gestational sac from around this point, so this is a reasonable window to go in for one.
Next Steps
Book your scan in the next few days with your gynaecologist, who can confirm the pregnancy is in the uterus and check for a heartbeat if it's visible yet. If nothing is seen at this stage, a repeat scan in a week usually clarifies it.
Health Tips
Go in sooner if you have one-sided pelvic pain, dizziness, or bleeding, since these need checking before the scheduled scan date.