Bleeding after transfer

Hi, i had a frozen embryo transfer o the 4th March- only one 5 days embryo was returned. after 10 days- on the 14th March i had a pregnancy test which was possitive with beta level of 555. on lat friday i started heavy bleeding with abdominal pain which was similar to a period pain, a few hors after i saw something that looks like a iece of meat (sorry for the description) coming down. i thought i misscarried but the lood test i had on Sunday showed a beta levelof 4100 followed by another blood test today which was 7100. the bleeding stopped on Saturday but their is still ligt bleeding here and there and today i started feelin that abdominal period loke pain again. what can it be? is there any explination to allof that? am i now in a higher rist of misscariage? i i wont misscarry- can all of that harm the baby or can the baby be at any risk?is there anything i cando to stop that from happening? i really appreciate your help and thank you.