TTC with second child

Keira

Guys I’m freaking out!! Lately I’ve been desperate for a second baby! So much so that I’ve been obsessive with the ovulation kits! My LMP was 18th March 2018 and I took a ovulation test on the 28th of this month which was positive (for those wondering I used the Clearblue digital and a smiley face appeared) so my partner and I had intercourse then again on Saturday and I took a second ovulation test yesterday which was negative so I’m wondering have I ovulated and missed my fertile window or is there a chance I could of hopefully conceived? Any info and help would be much appreciated 😊