4 weeks Pregnant

Hi all. It's me again. Any mummies experienced bleeding (not alot) accompanied but slight cramps & lasted for 3 days but off & on then when urine there are blood but abit only on & off also? I'm at 4 weeks. Went NUH on 26th & HCG still low based on my test kit too (faint lines), gynae cannot conclude anything as still early. I'm getting my blood test again next week to see if any progress on the HCG level. Meanwhile, I tested again yesterday & the lines darkened & no more bleeding since yesterday. I wonder if any mummies experienced it & it is normal. I even googled abt Ectopic Pregnancy. Hopefully it isn't as I do not have any intense crampings. Thank you mummies.