My period lasted a day or 2. the 1st day was a lil heavy with blood clots when i pee. the next morning, it suddenly becomes light. what does this mean? one thing i know that bleeding have blood clots while implantation bleed doesnt have blood clots?

See below: Conception occurs within day or so of the sex. It takes about 3 weeks for the embryo to make enough HCG for a positive pregnancy test. Blood test may be done a day after a missed period. Home pregnancy tests should be done 4-5 days after the missed period. If the result is negative repeat the test in 4-5 days. Use first morning urine and follow instructions for the test carefully.