that link definitely exists on traditional projects, but i don’t see the link on newer collection project pages. however, the url for such a link can be modified for use by a collection project by simply changing the project id (ex. https://www.inaturalist.org/observations/widget?project_id=78118).
probably the easiest way to find the numeric ID of a project is to open one of your own observations in a collection project that you’re a member of (ex. for @coloradobirder, https://www.inaturalist.org/observations/53079902), using the website. then you can look in the projects section of the observation detail page, and mouseover or copy the link of the project that you’re interested in. that link will contain the numerical id (although when you actually click on it, it will be translated into the non-numerical “slug”).
@coloradobirder, i think you may have also asked more specifically for only observations made by you in that project, and i think the way to do that is to slightly modify the code that the project widget page gives you. that code will include a script tag that looks something like this:
<script type="text/javascript" charset="utf-8" src="https://www.inaturalist.org/observations/project/78118.widget?layout=large&limit=5&order=desc&order_by=observed_on"></script>
just take the code and add &user_id=coloradobirder to the end of the URL in the src="..." part of the script tag. for example:
<script type="text/javascript" charset="utf-8" src="https://www.inaturalist.org/observations/project/78118.widget?layout=large&limit=5&order=desc&order_by=observed_on&user_id=coloradobirder"></script>