New here, need advice please

Hi ladies. I am on day 46 of my cycle and a week late. My (only) ovary cramped last week but no period. My lower tummy is bloated and my breasts (at least seem to be) more full. I should note that my last period was Feb. 18-21. It was REALLY heavy and painful. However, I did have what appeared to be implantation bleeding 6 days after ovulation (prior to my last period). So then if I would be pregnant, ai would assume we conceived after that. I'm at least a week late, at what point do I need to see an OBGYN? Does it sound promising? I'm going on 35 and my SO is 38 and this would be our first so we're excited at the idea. I have taken at least 8 pregnancy tests over the last two weeks and they're all negative.