Hello everyone!!

My husband and I have been trying to conceive for 1.5 years. My periods are very regular every 28 days. I ovulated on day 14 of my cycle. Was due for my period yesterday, have had some abdominal cramping. Woke up with some red blood and a hint of brown yesterday and haven’t bled since. Was due for my period yesterday so I initially thought that was it! I took a rapid pregnancy test which was negative… is it just too soon to detect if implantation was possibly yesterday?!?!