So my fertile week was June 16-22 and I had unprotected intercourse June 15,16,18,19 and 20

However I had cramping in my lower abdomen around June 27-29 fast forward to July 13-16 I had very light bleeding,normally I would pass clots and bleed heavily for at least 5-6 days but this time it was very light and I only used 3 sanitary napkins and one panty liner on the last day…Since the 27 of June I have been feeling extremely sick,throwing up,not able to eat,unable to sleep but extremely tired, but all my pregnancy tests have been negative…do yall think that was indeed a period or should I do a blood test?